Filmed entirely in New York and based on the popular series of young-adult novels by Cecily von Ziegesar, "Gossip Girl" revolves around the privileged prep school teens on Manhattan's Upper East Side and the anonymous blogger, Gossip Girl, who provides them with the latest gossip about their exclusive circle. In the series opener, Gossip Girl is busy spreading the news that "it girl" Serena van der Woodsen (Blake Lively) has returned to Manhattan after a mysterious and self-imposed exile to boarding school. Serena's best friend, Blair Waldorf (Leighton Meester), has conflicted feelings about her friend's return since she has enjoyed being the Queen Bee during Serena's absence and might not be ready to relinquish her new position on the social ladder, not to mention the fact that she has always suspected there may be unspoken feelings between Serena and her longtime boyfriend, Nate (Chace Crawford). Penn Badgley, Taylor Momsen, Ed Westwick, Kelly Rutherford and Matthew Settle also star. Mark Piznarski directed the pilot written by executive producers Josh Schwartz & Stephanie Savage.

In the wake of the scandalous Kiss on the Lips party, Serena (Blake Lively) receives an icy cold reception from her best friend Blair (Leighton Meester), who reveals that she knows Serena slept with her boyfriend, Nate (Chace Crawford), before mysteriously running off to boarding school. As if it couldn’t get any chillier, Serena decides to take Dan (Penn Badgley) to arch-enemy Chuck’s (Ed Westwick) fundraiser brunch at The Palace, and Jenny (Taylor Momsen) seeks advice from Blair, who realizes she may have something to gain by allowing Jenny into her inner circle. Kelly Rutherford and Matthew Settle also star. Mark Piznarski directed the episode written by executive producers Josh Schwartz & Stephanie Savage.

As the Upper East Side teens from Constance Billard and St. Jude’s prepare for a much-anticipated visit from the Ivy League representatives, Blair (Leighton Meester) uncovers a scandalous secret about Serena (Blake Lively) that may not remain a secret much longer. Dan (Penn Badgley) has his heart and future set on the coveted usher position for the Dartmouth rep, only to be beat out by Nate (Chace Crawford), who has no interest in the school despite pressure from his controlling father, The Captain (Sam Robards). Meanwhile, Jenny (Taylor Momsen) bonds with Serena’s younger brother, Eric (Connor Paolo), and Rufus (Matthew Settle) must swallow his pride and ask Lily (Kelly Rutherford) for a favor to help his son, Dan. Ed Westwick also stars. J. Miller Tobin directed the episode written by Felicia D. Henderson.

Blair (Leighton Meester) is thrilled when her mother, Eleanor (Margaret Colin), chooses her to be the new face of her clothing line. However, Blair’s happiness soon turns to feelings of betrayal and jealousy when Serena (Blake Lively) moves into the spotlight and Blair is finds herself back in Serena’s shadow. Meanwhile, Serena and Dan (Penn Badgley) are reminded once again that they come from two very different worlds, and Nate (Chace Crawford) and Chuck (Ed Westwick) indulge in a boys’ weekend to blow off steam after Ivy Week. Taylor Momsen, Kelly Rutherford and Matthew Settle also star. The episode directed by Patrick Norris was written by Joshua Safran.

Dan (Penn Badgley) makes elaborate plans to impress Serena (Blake Lively) on their first official date. The same night, Jenny (Taylor Momsen) is invited to the infamous Blair Waldorf (Leighton Meester) sleepover and finds herself in a high stakes game of “truth or dare.” Meanwhile, when Lily (Kelly Rutherford) discovers that Eric (Connor Paolo) is missing from his treatment center, she finds herself seeking help from her ex-boyfriend, Rufus (Matthew Settle). Chace Crawford and Ed Westwick also star. The episode directed by Jamie Babbit was written by Lenn K. Rosenfeld

Dan (Penn Badgley) is torn between two girls when his childhood friend, Vanessa (Jessica Szohr), returns home and declares her feelings for him, just as he and Serena (Blake Lively) are trying to figure out what they mean to each other. At the infamous masked ball, Blair (Leighton Meester) sends Nate (Chace Crawford) on a scavenger hunt, but Nate is ultimately still distracted by his feelings for Serena. Although Blair makes it perfectly clear that outsiders are not welcome, a disguised Jenny (Taylor Momsen) and Dan sneak into the ball. Finally, Lily (Kelly Rutherford) asks Rufus (Matthew Settle) to accompany her to an Eleanor Waldorf (Margaret Colin) event in order to make Bart Bass (Robert John Burke) jealous. “America’s Next Top Model” winner CariDee English makes a cameo as Bart Bass’ date. The episode was directed by Norman Buckley and written by Jessica Queller.

After surviving the on-again/off-again nature of their new relationship, Serena (Blake Lively) and Dan (Penn Badgley) finally acknowledge they are crazy about each other, despite their polar opposite worlds that constantly threaten to pull them apart. Chuck (Ed Westwick) contemplates investing in a burlesque club in the hopes of making his hard-to-please father, Bart (guest star Robert John Burke), proud of him. Nate (Chace Crawford) confronts his father, Captain (guest star Sam Robards), about the drugs he found in the house, but his father denies having a problem. Jenny (Taylor Momsen) discovers a secret her father, Rufus (Matthew Settle), and mother, Alison (guest star Susan Misner), have been keeping from her. Finally, Blair (Leighton Meester) is once again devastated by Nate’s actions after Jenny reveals that Nate kissed her by accident thinking she was Serena. The episode was directed by Tony Wharmby and written by K.J. Steinberg.

Devastated by the current state of her relationship with Nate (Chace Crawford) and still dealing with the guilt from her recent indiscretion, Blair (Leighton Meester) puts on a happy face for her 17th birthday party and attempts to hide the truth from her friends. Hoping to ease the tension between Serena (Blake Lively) and Vanessa (guest star Jessica Szohr), Dan (Penn Badgley) takes Vanessa to Blair’s party so the girls can have some bonding time, but this only ends up making Serena more uncomfortable. Jenny (Taylor Momsen) brings her mom (guest star Susan Misner) home for a surprise visit, but Rufus (Matthew Settle) may not be ready to forgive and forget. Nate’s parents (guest stars Sam Robards and Francie Swift) ask him to make a huge sacrifice in an effort to salvage his father’s business as he faces charges of embezzlement and fraud. Ed Westwick and Kelly Rutherford also star. The episode was directed by Lee Shallat Chemel and written by Felicia D. Henderson.

When Dan (Penn Badgley) hears that Serena (Blake Lively) and her family are spending Thanksgiving alone at The Palace, he naively invites them to spend the holiday with his family, creating an uncomfortable situation for Rufus (Matthew Settle) and Lily (Kelly Rutherford) whose children are unaware of their complicated romantic history. Meanwhile, Blair’s (Leighton Meester) emotions spiral out of control when she learns that her father isn’t coming home for Thanksgiving. Nate (Chace Crawford) spends the holiday with his mom (guest star Francie Swift) and dad (guest star Sam Robards), but their awkward dinner quickly goes from bad to worse. Taylor Momsen also stars. The episode was directed by Mark Piznarski and written by K.J. Steinberg & Jessica Queller.

Serena (Blake Lively) has absolutely no intention of attending the upcoming Debutante Ball, until her grandmother, CeCe (guest star Caroline Lagerfelt), announces that she won’t take no for an answer. Unfortunately, Dan (Penn Badgley) isn’t exactly what CeCe had in mind in terms of a suitable escort for Serena, and she makes her opinion heard loud and clear, causing a riff between Serena and Dan. Although they are officially broken up, Blair (Leighton Meester) and Nate (Chace Crawford) decide to go to the ball together as friends, but a jealous Nate begins to suspect that Blair may already be seeing someone else. Jenny (Taylor Momsen) finds herself torn between attending her mother’s (guest star Susan Misner) art opening or following her dreams to the Debutante Ball, even though it’s against her parents’ wishes. Finally, Rufus (Matthew Settle) learns the real reason Lily (Kelly Rutherford) broke up with him all those years ago. Ed Westwick also stars. The episode was directed by Patrick Norris and written by Joshua Safron.

When Blair’s (Leighton Meester) father, Harold (guest star John Shea), comes home for the holidays with an unexpected guest — his boyfriend, Roman (guest star William Abadie) — Blair finds it difficult to hide her disappointment and hatches a plan to get rid of Roman for good. Jenny (Taylor Momsen) and Vanessa (Jessica Szohr) help Serena (Blake Lively) plan the best Christmas surprise ever for Dan (Penn Badgley), who may have a surprise of his own in mind for Serena. Chuck (Ed Westwick) texts Blair that Nate (Chace Crawford) has joined him in Monaco, worrying Blair that Chuck may disclose the details of their hook-up. Rufus (Matthew Settle) refuses to remain the understanding husband any longer after Alison’s (guest star Susan Misner) former lover calls the house. Kelly Rutherford also stars. The episode was directed by Michael Fields and written by Jessica Queller.

Serena (Blake Lively), Blair (Leighton Meester), Nate (Chace Crawford), Chuck (Ed Westwick) and their entourage break into the school swimming pool for a night of fun, but when a member of their group nearly drowns, the school threatens to expel the person responsible for the break-in. Everyone agrees to keep a secret pact and say nothing, but it ultimately creates major tension between Serena and Dan (Penn Badgley), who isn’t sure he’s ready to take the fall for someone else and risk his future. Vanessa (Jessica Szohr) is working on a documentary project about private schools and accidentally captures Blair and Chuck discussing their affair. Lily (Kelly Rutherford) contemplates telling Rufus (Matthew Settle) how she really feels about him. Taylor Momsen also stars. The episode was directed by Tony Whamby and written by Lenn K. Rosenfeld.

Gossip Girl takes pleasure in reporting that Serena van der Woodsen (Blake Lively) was spotted buying pregnancy tests. Of course, on the Upper East Side, the truth is often even juicier and more scandalous than the gossip, and this time is no exception. Leighton Meester, Penn Badgley, Chace Crawford, Taylor Momsen, Ed Westwick, Kelly Rutherford and Matthew Settle also star. The episode was directed by Norman Buckley and written by Felicia D. Henderson.

Having been recently dethroned as Queen Bee in the last episode by Gossip Girl, with an assist from scheming “little J” (Taylor Momsen), Blair (Leighton Meester) hesitantly returns to school with the support of her BFF, Serena (Blake Lively). Meanwhile, Serena struggles to adjust to her new living arrangements with her future step-brother, Chuck (Ed Westwick), while receiving disturbing packages from an unknown sender. Jenny’s drive to be popular hits an all-new time high when she does something illegal to fit in with her new Upper East Side friends. Penn Badgley, Chace Crawford, Kelly Rutherford and Matthew Settle also star. The episode was directed by J. Miller Tobin and written by KJ Steinberg.

Serena’s Upper East Side world is turned upside down when her former partner in all things bad, Georgina Sparks guest star Trachtenberg, returns to Manhattan to stir up trouble and Serena’s past. When Dan Penn Badgley notices that Serena seems preoccupied he jumps to the conclusion that it must have something to do with Serena’s new roomie and soon-to-be step-brother, Chuck Ed Westwick. Nate Chace Crawford finds romance with the last person he was expecting to connect with, Vanessa Jessica Szohr. Jenny Taylor Momsen meets a new guy, Asher Hornsby guest star Jesse Swenson, who just might be her ticket to permanent popularity. Finally, Blair Leighton Meester hatches a secret plan to sabotage her biggest rival, Nelly Yuki guest star Yin Chang. Matthew Settle also stars. The episode was directed by Michael Fields and written by Felicia D. Henderson.

Georgina (guest star Trachtenberg) informs Serena (Blake Lively) that she is prepared to reveal damaging information from Serena’s past, but no one is prepared for what Georgina does next. Blair (Leighton Meester) and Jenny (Taylor Momsen) escalate their “popularity war” by spreading scandalous rumors about each other through Gossip Girl. Dan (Penn Badgley) witnesses Jenny’s new boyfriend, Asher (guest star Jesse Swenson), cheating on her, but Jenny refuses to listen to her brother’s warning. Rufus (Matthew Settle) goes to Lily (Kelly Rutherford) for advice on how to handle Jenny’s recent out-of-character behavior. Jessica Szohr also stars. The episode was directed by Janice Cooke and written by Paul Sciarrotta.

As a result of Georgina (guest star Trachtenberg) revealing the true reason that Serena (Blake Lively) fled Manhattan for boarding school, Serena falls back into her old habits and Blair (Leighton Meester), Nate (Chace Crawford) and Chuck (Ed Westwick) must put their complicated feelings for each other aside to help their friend. Unfortunately, Serena is too ashamed to share the truth with Dan (Penn Badgley), leaving him only to assume the worse about his girlfriend. Rufus (Matthew Settle) is thrilled when his band is invited to perform at a Rolling Stone-sponsored concert, but Lily (Kelly Rutherford) is the last person on earth he expects to see at the performance, especially since her wedding rehearsal dinner is the same night. Lisa Loeb and famous cake designer Sylvia Weinstock appear in the episode as themselves. Jessica Szohr also stars. The episode was directed by Tony Wharmby and written by Joshua Safran.

With her best friend Serena’s (Blake Lively) life and reputation on the line, Blair (LeightonMeester) decides to take matters into her own hands in dealing with the manipulative and evil Georgina Sparks (guest star Michelle Trachtenberg). With Rufus (Matthew Settle) never far from her thoughts, Lily (Kelly Rutherford) prepares for her wedding day which is destined to be the Upper East Side’s social event of the year. Serena finally pours out her heart and the truth about her past to Dan (Penn Badgley), but will it prove to be too late to save their relationship? Heiress and model Lydia Hearst guest stars in the episode as Amelia, Lily’s interior decorator. Chace Crawford, Taylor Momsen, Ed Westwick and Jessica Szohr also star. The episode was directed by Norman Buckley and written by executive producers Josh Schwartz & Stephanie Savage.

Guest Stars include author Jay McInerney, socialite Tinsley Mortimer and actress Madchen Amich — As the summer draws to a close in the Hamptons, Serena (Blake Lively) and Nate (Chace Crawford) have everyone fooled into thinking they are a couple to cover up the fact that Nate has been hooking up with a married older woman (guest star Amick) and Serena has been secretly mourning her break-up with Dan (Penn Badgley). Blair (Leighton Meester) returns from abroad with a hot guy on her arm (guest star Patrick Heusinger), making a very jealous Chuck (Ed Westwick) question his decision to leave Blair stranded at the heliport. Dan has spent the summer assisting a famous author (guest star McInerney), but decides to head to the Hamptons to see how things stand with Serena after a summer spent apart. While interning for Eleanor Waldorf’s company, Jenny (Taylor Momsen) sneaks an invite to a much-coveted Hamptons’ White Party at which Eric (Connor Paolo) introduces her to socialite Tinsley Mortimer. Matthew Settle also stars. J. Miller Tobin directed the episode written by Joshua Safran.

Blair (Leighton Meester) is over the moon that she is dating royalty and has every intention of becoming a royal herself, but a scheming Chuck (Ed Westwick) has other plans for Blair and her new love, Marcus (guest star Patrick Heusinger). Serena (Blake Lively) and Dan (Penn Badgley) agree to keep their recent hook-ups a secret from their friends and family until they figure out what all this means for their relationship. Meanwhile, Nate (Chace Crawford) learns the downside to having an affair with a hot older woman, Catherine (guest star Madchen Amick), who also happens to be married. Taylor Momsen, Jessica Szohr and Matthew Settle also star. Michael Fields directed the episode written by executive producer Stephanie Savage.

Serena (Blake Lively) and Dan (Penn Badgley) are forced to deal with their unspoken problems while trapped in an elevator during a citywide blackout. In a humorous twist, Blair (Leighton Meester) questions the lack of passion in her relationship with Marcus (guest star Patrick Heusinger), while at the same time Chuck (Ed Westwick)appears to have lost his “passion” for any woman other than Blair. Meanwhile, Nate (Chace Crawford) struggles between his feelings for Vanessa (Jessica Szohr) and his more-complicated-by-the-day relationship with Catherine (guest star Madchen Amick). Jenny (Taylor Momsen) risks losing her internship when Eleanor (Margaret Colin) catches Jenny critiquing one of the Eleanor Waldorf designs. Matthew Settle also stars. Janice Cooke directed the episode written by John Stephens.

When Serena (Blake Lively) notices that Dan (Penn Badgley) has been cozying up to the new girl in school, Amanda (guest star Laura-Leigh), the ever-loyal Blair (Leighton Meester) and her minions decide to befriend Amanda and sabotage her budding new romance with “lonely boy.” Vanessa (Jessica Szohr) discovers a scandalous secret about Catherine (guest star Madchen Amick) and enlists Blair’s scheming expertise to use the information to help Nate (Chace Crawford). Meanwhile, Lily (Kelly Rutherford) finds herself drawn back to her ex, Rufus (Matthew Settle), once again. Taylor Momsen and Ed Westwick also star. Jim McKay directed the episode written by Robby Hull.

Designer Michael Kors and socialites Tinsley Mortimer and Cristina Cuomo make cameo appearances at Eleanor Waldorf’s show. In the midst of Fashion Week, a furious Blair (Leighton Meester) learns that her mother, Eleanor (guest star Margaret Colin), at the suggestion of her protégé Jenny (Taylor Momsen), has given Serena (Blake Lively) and her new socialite friend, Poppy Lifton (guest star Tamara Feldman), front row seats to the Eleanor Waldorf show. Hurt once again by Serena’s popularity and her mother’s betrayal, Blair decides to sabotage the show. Meanwhile, Dan (Penn Badgley) starts hanging out with Chuck (Ed Westwick), but a walk on the dark side always has its risks and Dan learns that the hard way. Lily (Kelly Rutherford) learns a secret that her new husband, Bart (guest start Robert John Burke), has been keeping from her. Matthew Settle also stars. Patrick Norris directed the episode written by Jessica Queller.

After Blair (Leighton Meester) and Serena (Blake Lively) get into a catfight, Serena decides to get even with Blair, who has always dreamed of attending Yale, by ditching her plans to visit Brown, and instead accepting the Dean of Yale’s personal invitation to visit the school. After discovering that none of his recommendation letters for Yale were ever submitted, Dan (Penn Badgley) frantically tries to figure out a way to salvage his chances of getting into the school. While on the Yale campus, Chuck (Ed Westwick) is kidnapped by a group of Skull and Bones members and Nate (Chace Crawford) hooks up with a co-ed. Taylor Momsen, Jessica Szohr, Kelly Rutherford and Matthew Settle also star. Norman Buckley directed the episode written by Alexandra McNally & Joshua Safran.

Vanessa (Jessica Szohr) uses the scandalous picture of Catherine and Marcus to blackmail Blair (Leighton Meester) into being a nicer person, so Blair seeks revenge by enticing Chuck (Ed Westwick) to seduce Vanessa. Lily (Kelly Rutherford) and Bart (guest star Robert John Burke) throw an extravagant housewarming party and expect their children to make them proud in front of the attending press, but a rebellious Serena (Blake Lively) isn’t ready to play by their rules. Meanwhile, Dan (Penn Badgley) and Jenny (Taylor Momsen) discover a big secret that Nate (Chace Crawford) has been keeping from his friends. Matthew Settle also stars. Tony Wharmby directed the episode written by Lenn K. Rosenfeld.

Jenny (Taylor Momsen) befriends a young model, Agnes (guest star Willa Holland), who encourages Jenny to not only explore her wild side, but also confront her boss, Eleanor Waldorf (guest star Margaret Colin), who is attempting to “borrow” Jenny’s designs. Serena (Blake Lively) and Dan (Penn Badgley) agree to attend an art opening at Rufus’ (Matthew Settle) gallery as friends, but the outing gets a little uncomfortable after Serena meets an artist, Aaron Rose (guest star John Patrick Amedori), and realizes they have an instant chemistry. Blair (Leighton Meester) attempts to seduce Chuck (Ed Westwick), but it proves tougher than she ever imagined. Chace Crawford and Jessica Szohr also star. Vondie Curtis Hall directed the episode written by Amanda Lasher.

Serena (Blake Lively) invites Aaron (guest star John Patrick Amedori) to be her guest at a charity gala honoring Lily and Bart (Kelly Rutherford and guest star Robert John Burke), but after discovering a secret that Aaron has been keeping from her she begins to question whether Aaron is the guy she thought he was. Hoping it will help her chances of getting into Yale, Blair (Leighton Meester) naively agrees to babysit the 15-year-old daughter of a prominent Yale donor, but the teenager proves to be more than a handful and Blair begins to suspect that the evening may actually wind up hurting her chances of getting into the college of her dreams. Meanwhile, Jenny (Taylor Momsen) and Agnes (guest star Willa Holland) plan a guerilla fashion show that will either launch Jenny’s star or ruin her chances of ever being accepted by the industry. Penn Badgley, Chace Crawford, Ed Westwick, Jessica Szohr and Matthew Settle also star. Michael Fields directed the episode written by Etan Frankel & John Stephens.

Blair (Leighton Meester) does not approve of the new man, Cyrus Rose (guest star Wallace Shawn), in her mother’s (guest star Margaret Colin) life, so she makes it her mission to break up the lovebirds by any means necessary. Jenny (Taylor Momsen) moves in with Agnes (guest star Willa Holland) as the friends move forward with their plans for a fashion line. Serena (Blake Lively) continues to fall for the new guy in her life, Aaron (guest star John Patrick Amedori), but she learns something about him that threatens to end things just as they are getting really good. Dan (Penn Badgley) decides to win the trust of Bart Bass (guest star Robert John Burke) in order to learn more about the man and possibly write an expose on him for Vanity Fair, but things get heated after Chuck (Ed Westwick) finds out the real reason Dan is spending so much time around his family. Matthew Settle also stars. David Von Ancken directed the episode written by Jessica Queller.

Thanksgiving in the Waldorf household finds Blair (Leighton Meester) upset that her mom’s (Margaret Colin) new boyfriend, Cyrus (guest star Wallace Shawn), has decided to ruin all her favorite traditions, but that’s nothing compared to what’s coming next. Lily (Kelly Rutherford) finds herself trying to broker a peace treaty between Rufus (Matthew Settle) and Jenny (Taylor Momsen) who is prepared to cut off all communication with her father if she doesn’t get her way. Serena (Blake Lively) isn’t quite ready to come clean with Aaron (guest star John Patrick Amedori) about her complicated past, but Dan (Penn Badgley) ends up accidentally revealing a few tidbits of his own. Blair and Chuck (Ed Westwick) come to their friend’s aid when Nate (Chace Crawford) is once again forced to confront his father’s (guest star Sam Robards) abandonment. Finally, Eric (Connor Paolo) discovers a secret that Bart (Robert John Burke) has been keeping from Lily. Jessica Szohr also stars. Jean DeSegonzac directed the episode written by Joshua Safran.

For the annual Snowflake Ball, Blair (Leighton Meester) and Chuck (Ed Westwick) make a bet that they can find the ideal dates for each other. Aaron’s (John Patrick Amedori) ex-girlfriend, Lexi (guest star Natalie Knepp), expresses an interest in Dan (Penn Badgley) which creates conflicted feelings for Serena (Blake Lively). Nate (Chace Crawford), Jenny (Taylor Momsen) and Vanessa (Jessica Szohr) get into a tangled situation that puts their friendships and hearts on the line. Kelly Rutherford and Matthew Settle also star. Patrick Norris directed the episode written by Robby Hull.

A sudden and tragic event impacts the lives of our favorite Upper East Side teens and their parents. Blake Lively, Leighton Meester, Penn Badgley, Chace Crawford, Taylor Momsen, Ed Westwick, Kelly Rutherford and Matthew Settle star.

With Chuck (Ed Westwick) MIA since his father’s funeral, Uncle Jack (Harrington) arrives on the Upper East Side to help Chuck pick up the messy pieces, but first he has to find him. Trying her best to forget her last painful exchange with Chuck, Blair (Leighton Meester) focuses her attention on being accepted into the most prestigious ladies club in teh city, Colony Club. Jenny (Taylor Momsen) returns to Constance Billard and immediately takes on Penelope (guest star Amanda Setton) and her posse of mean girls, but no one is going down without a valiant Gossip Girl-worthy fight. Blake Lively, Penn Badgley, Kelly Rutherfod and Matthew Settle also star. Tony Wharmby directed the episode written by John Stepehens.

With the reading of Bart’s will, Chuck (Ed Westwick), Bart’s brother, Jack (guest star Desmond Harrington), and Lily (Kelly Rutherford) learn the fate of the Bass empire. Rufus (Matthew Settle) and Lily’s relationship is strained as Rufus seeks details about the child he never knew he had. Noticing that his father has been acting strangely as of late, Dan (Penn Badgley) does some investigating and uncovers Rufus and Lily’s secret, putting him in the awkward situation of deciding what to do with this shocking revelation and who to share it with. Blake Lively, Leighton Meester, Chace Crawford, Taylor Momsen and Jessica Szohr also star. Tricia Brock directed the episode written by Amanda Lasher.

It’s that stressful time of year when Constance Billard and St. Jude’s students find out who is and isn’t worthy of early admission to Yale University. Serena (Blake Lively) bonds with her new Shakespeare teacher, Rachel (guest star Laura Breckenridge), who has no clue the wrath she is about to suffer after giving Blair (Leighton Meester) the first B of her prep school career. Chuck (Ed Westwick) pairs up with an unlikely ally in his war with Jack (guest star Desmond Harrington) over Bass Industries. Nate (Chace Crawford) and Vanessa (Jessica Szohr) spend a romantic evening at the opera. Taylor Momsen, Kelly Rutherford and Matthew Settle also star. Janice Cooke directed the episode written by Joshua Safran.

In retaliation for not playing by the unspoken rules of Constance Billard, Blair (Leighton Meester) hatches a plan to bring down her teacher, Rachel (guest star Laura Breckenridge), and it’s going to be good. After Chuck (Ed Westwick) wakes up in a hotel and only has a minor recollection of what happened the previous evening and who he spent the evening with, Nate (Chace Crawford) and Vanessa (Jessica Szohr) try to help him fill in the missing pieces of what is turning out to be an increasingly intriguing mystery. Blake Lively, Penn Badgley, Taylor Momsen, Kelly Rutherford and Matthew Settle also star. Liz Allen directed the episode written by Alexandra McNally & Lenn K. Rosenfeld.

The Constance Billard and St. Jude seniors put on a production of “The Age of Innocence” and find their personal lives mirroring conflicts in the play. Serena (Blake Lively) develops a crush on the play’s director, Julian (guest star Harmon Walsh), and enlists Vanessa’s (Jessica Szohr) knowledge of theater to help her get the otherwise uninterested guy’s attention. Blair (Leighton Meester) receives devastating news about her future that leads her on a witch-hunt for the person responsible. Dan (Penn Badgley) and Rachel (guest star Laura Breckenridge) agree to stay away from each other in the aftermath of being discovered as more than teacher and student, but find it impossible to keep that promise. Chuck (Ed Westwick) enlists help from an unlikely source, his nemesis Carter Baizen (guest star Sebastian Stan). Chace Crawford, Taylor Momsen and Matthew Settle also star. Norman Buckley directed the episode written by Jessica Queller.

Devastated by the recent plot twist in her life, Blair (Leighton Meester) turns her back on her predictable Waldorf existence in favor of a more wild and unpredictable lifestyle, causing Serena (Blake Lively) and Chuck (Ed Westwick) to have serious concerns about their friend. Vanessa (Jessica Szohr) convinces Nate (Chace Crawford) that it may be time to forgive and forget when it comes to his mother’s Kennedyesque family, The Vanderbilts, who abandoned Nate and his mother when they needed them most. In a misguided effort to be completely honest with each other, Lily (Kelly Rutherford) and Rufus (Matthew Settle) agree to share lists of their past lovers. Penn Badgley and Taylor Momsen also star. J. Miller Tobin directed the episode written by Robby Hull & Etan Frankel.

Serena (Blake Lively) decides to throw Jenny (Taylor Momsen) an intimate party for her sixteenth birthday, but things get way out of control when Poppy Lifton (guest star Tamara Feldman) turns the small gathering into a huge social event. In a moment of weakness, Vanessa (Jessica Szohr) agrees to help Chuck (Ed Westwick) with a scheme having to do with Blair (Leighton Meester) and Nate (Chace Crawford). Rufus (Matthew Settle) learns that Dan (Penn Badgley) will not receive financial aid at Yale and tries to figure out another way to cover the cost of his education. Kelly Rutherford also stars. Armie Hammer guest stars as Poppy’s boyfriend, Gabriel. Allison Liddi-Brown directed the episode written by Sarah Frank-Meltzer.

Serena (Blake Lively) returns from her trip to Spain with Poppy (guest star Tamara Feldman) and Gabriel (guest star Armie Hammer). Blair (Leighton Meester) makes a secret deal with Nate’s (Chace Crawford) grandfather, William (guest star James Naughton), and Nate learns some disturbing information about his father’s arrest. Dan (Penn Badgley) takes a job as a cater-waiter to earn money for college, but is distressed when he discovers the gig is a Passover seder at the Waldorf penthouse and several of his friends and family are guests. Taylor Momsen, Ed Westwick, Kelly Rutherford and Matthew Settle also star. John Stephens directed the episode written by Amanda Lasher.

Georgina (guest star Michelle Trachtenberg, “17 Again”) returns to the Upper East Side after undergoing a major transformation. Chuck (Ed Westwick) and Nate (Chace Crawford) find themselves at a major crossroads in their relationship as it pertains to their mutual interest in Blair (Leighton Meester). Serena (Blake Lively) finds her relationship with Gabriel (guest star Armie Hammer) growing more complicated. Penn Badgley, Taylor Momsen, Jessica Szohr, Kelly Rutherford and Matthew Settle also star. Patrick Norris directed the episode written by Leila Gerstein.

Blair (Leighton Meester) pressures Georgina (Trachtenberg) into making amends for her past bad behavior by helping her in a scheme. The rivalry between Nate (Chace Crawford) and Chuck (Ed Westwick) over Blair comes to a head. Lily (Kelly Rutherford) hatches a secret plan to help Rufus (Matthew Settle) with Dan’s (Penn Badgley) college tuition. Blake Lively, Taylor Momsen and Jessica Szohr also star. Janice Cooke Leonard directed the episode written by Sara Goodman.

In a flashback to the 80s, 17-year-old Lily Rhodes (Snow) gets kicked out of boarding school and runs away to Los Angeles, reconnecting with her parents, Rick (McCarthy) and Cece (guest star Cynthia Watros, “Lost”), and sister, Carol (Ritter). Back in present day, Blair (Leighton Meester) and Nate (Chace Crawford) attend prom together, but the evening doesn’t turn out exactly as planned and Chuck (Ed Westwick) has a little something to do with that. Serena (Blake Lively) and Lily (Kelly Rutherford) don’t see eye-to-eye over Serena’s recent run-in with the law. No Doubt performs in the episode as an 80s band called “Snowed Out.” Penn Badgley, Taylor Momsen, Jessica Szohr and Matthew Settle also star. Marc Piznarski directed the episode written by Josh Schwartz & Stephanie Savage.

Gossip Girl decides to liven things up at the Constance Billard and St. Jude’s graduation by sending out a shocking and damaging email blast in the midst of the commencement ceremony, stirring Serena (Blake Lively) to come up with a plan of attack. The Mean Girls (guest stars Yin Chang, Nicole Fiscella, Amanda Setton and Dreama Walker) challenge Jenny (Taylor Momsen) to throw her hat in the ring to succeed Blair (Leighton Meester) as Queen Bee next year. Lily (Kelly Rutherford) and Rufus (Matthew Settle) struggle to repair their relationship after Lily’s betrayal. As for the cliffhangers, Blair and Chuck (Ed Westwick) finally…and Serena is shocked by…and Georgina (guest star Michelle Trachtenberg) decides to…and Dan (Penn Badgley), Nate (Chace Crawford) and Vanessa (Jessica Szohr) unknowingly….and it all happens in the series’ climactic season finale. Norman Buckley directed the episode written by Joshu! a Saffran.

Gossip Girl Returns- As the summer is drawing to a close, Blair (Leighton Meester) and Chuck (Ed Westwick) are madly in love and adjusting to their new “in a relationship” status, breaking all traditional rules of dating as would be expected. Serena (Blake Lively) returns from her European adventure with many secrets to hide and a complicated relationship with Carter Baizen (guest star Sebastian Stan). Nate (Chace Crawford) returns from his travels with a mysterious brunette, Bree Buckley (guest star JoAnna Garcia) in tow. Rufus (Matthew Settle), Dan (Penn Badgley) and Jenny (Taylor Momsen) spent the summer in the Hamptons, adjusting to the van der Woodsen’s glamorous lifestyle surprisingly faster than any of them expected. Jessica Szohr also stars. J. Miller Tobin directed the episode written by Joshua Safran.

IS NYU READY FOR BLAIR WALDORF? / MICHELLE TRACHTENBERG RETURNS AS GEORGINA — Blair (Leighton Meester), who is determined to maintain her Queen status in college, embarks on her first day at NYU, along with Dan (Penn Badgley) and Vanessa (Jessica Szohr). Unfortunately, Georgina (guest star Michelle Trachtenberg) turns up as Blair's roommate in the dorms, determined to make Blair a social outcast. As Serena (Blake Lively) prepares to depart for Brown, she and Chuck (Ed Westwick) have a major falling out, so she recruits Chuck's enemy, Carter (guest star Sebastian Stan), to help her get even. Nate (Chace Crawford) and Bree (guest star JoAnna Garcia) decide to explore their relationship further, knowing full well it could cause tension between their families who are political rivals. Taylor Momsen and Matthew Settle also star.

BLAIR VS. CHUCK — It’s an Upper East Side face-off when Blair (Leighton Meester) and Chuck (Ed Westwick) both set their sights on a particular item up for bid at Sotheby’s and the personal stakes are high. Serena (Blake Lively) suspects that Carter (guest star Sebastian Stan) may be up to his old habits, Georgina (Michelle Trachtenberg) takes an interest in Dan (Penn Badgley), and Vanessa (Jessica Szohr) begins to suspect that something isn’t quite right with Scott (guest star Chris Riggi). Chace Crawford, Taylor Momsen and Matthew Settle also star.

Jenny begins her reign as the new Queen Bee / Hilary Duff and Tyra Banks guest star It’s the first day of school at Constance Billard which means it’s also time for Jenny (Taylor Momsen) to take her rightful place as the new Queen Bee. Unfortunately for Jenny, Blair (Leighton Meester) is more than happy to intervene when news reaches her that she may be needed back at Constance. Lily (Kelly Rutherford) returns home to Rufus (Matthew Settle) and her family to find that things are definitely not as she left them. A famous movie actress, Olivia Burke (Hilary Duff), enrolls at NYU – and is assigned to be Vanessa’s (Jessica Szohr) roommate – hoping for a somewhat normal college experience. Tyra Banks guest stars as Ursula, and actress co-starring in Olivia’s movie and someone who Serena (Blake Lively) befriends. Penn Badgley, Chace Crawford and Ed Westwick also star. Mark Piznarski directed the episode written by John Stephens.

Jenny begins It’s the first day of school at Constance Billard which means it’s also time for Jenny (Taylor Momsen) to take her rightful place as the new Queen Bee. Unfortunately for Jenny, Blair (Leighton Meester) is more than happy to intervene when news reaches her that she may be needed back at Constance. Lily (Kelly Rutherford) returns home to Rufus (Matthew Settle) and her family to find that things are definitely not as she left them. A famous movie actress, Olivia Burke (Hilary Duff), enrolls at NYU – and is assigned to be Vanessa’s (Jessica Szohr) roommate – hoping for a somewhat normal college experience. Tyra Banks guest stars as Ursula, and actress co-starring in Olivia’s movie and someone who Serena (Blake Lively) befriends. Penn Badgley, Chace Crawford and Ed Westwick also star. Mark Piznarski directed the episode written by John Stephens.

Will Lily & Rufus go through with their planned nuptials / Sonic Youth performs in this episode / Hilary Duff and Michelle Trachtenberg guest star Lily (Kelly Rutherford) and Rufus (Matthew Settle) decide to move up their wedding to the next day, but will someone or something come between them before they become man and wife? Chuck (Ed Westwick) discovers a secret that Carter (Sebastian Stan) has been keeping from Serena (Blake Lively). Dan (Penn Badgley) and Vanessa (Jessica Szohr) are pulled into one of Georgina’s (Michelle Trachtenberg) schemes. Blair (Leighton Meester) is suspect of Bree (guest star JoAnna Garcia) and shares her concers with Nate (Chace Crawford). Taylor Momsen also stars. Ron Fortunato directed the episode written by Leila Gerstein.

Hilary Duff guest stars Vanessa (Jessica Szohr), hoping to finally win her mother Gabriela’s (guest star Gina Torres) approval, desperately vies with Blair (Leighton Meester) for the honor of delivering the freshman toast at NYU, but at what price? Dan (Penn Badgley) invites Olivia (guest star Hilary Duff) to meet Rufus (Matthew Settle) and Lily (Kelly Rutherford), which leads to all sorts of problems for the new couple. Serena (Blake Lively) and Nate (Chace Crawford) team up to help Carter Baizen (guest star Sebastian Stan). Taylor Momsen and Ed Westwick also star. John Stephens directed the episode written by Jake Coburn.

Jimmy Fallon & Hilary Duff guest star Olivia (guest star Hilary Duff) says something she regrets during her appearance on Jimmy Fallon’s (Fallon playing himself) talkshow and tries to keep Dan (Penn Badgley) from finding out. With election day around the corner, Nate (Chace Crawford) suspects his grandfather (guest star James Naughton) will stop at nothing to get Trip (guest star Aaron Tveit) elected to congress. In the midst of another feud with Serena (Blake Lively), Blair (Leighton Meester) befriends a new “it” girl and takes her to an election night party at Chuck’s (Ed Westwick) hotel, hoping to make Serena jealous. Taylor Momsen, Jessica Szohr, Kelly Rutherford and Matthew Settle also star.

Jenny conspires to be the ultimate Queen Bee / All-Girl rock band “Plastiscines” perform in the episode Not satisfied with just being Queen of Constance Billard, Jenny (Taylor Momsen) sets her sights on becoming the Queen of all the Upper East Side by landing the hottest escort for Cotillion. Nate (Chace Crawford) and Chuck (Ed Westwick) plot to help Serena (Blake Lively) and Blair (Leighton Meester) repair their damaged friendship. Dan (Penn Badgley) is upset when Olivia (guest star Hilary Duff) contemplates leaving school for a movie project. Jessica Szohr, Kelly Rutherford and Matthew Settle also star.

Guest performance by Lady Gaga! Hoping to impress the elititst theater kids at NYU, Blair (Leighton Meester) sets her sights on landing a private concert with the hottest musical performer of the year, Lady Gaga. Dan (Penn Badgley) and Olivia (guest star Hilary Duff) sign up to write and star in a school play, based on an idea by Blair and directed by Vanessa (Jessica Szohr). With Blair out of the picture, Serena (Blake Lively) turns to Nate (Chace Crawford) to help her get through a difficult situation. As a favor to Chuck (Ed Westwick), Jenny (Taylor Momsen) agrees to hang out with Damien (guest star Kevin Zegers), the son of an ambassador who is staying at Chuck’s hotel, but the experience proves to be a lot more intriguing than she expected. Kelly Rutherford and Matthew Settle also star. Tony Wharmby directed the episode written by Leila Gerstein.

THANKSGIVING ON THE UPPER EAST SIDE — It wouldn’t be Thanksgiving on the Upper East Side if there wasn’t a serving or two of some major drama for the holiday. Blair (Leighton Meester) suspects her mom (guest star Margaret Colin) has been keeping a big secret from her, but it turns out to be something else entirely. Vanessa (Jessica Szohr) is supposed to spend Thanksgiving with her parents, but has a fight with her mom (guest star Gina Torres) and shows up on Dan’s (Penn Badgley) doorstep. Rufus (Matthew Settle) learns that Lily (Kelly Rutherford) has been lying to him about her mother, Cece (guest star Caroline Lagerfelt). Chuck (Ed Westwick) tells Nate (Chace Crawford) that he has some potentially damaging information about one of their friends. Jenny (Taylor Momsen) learns that Eric (Connor Paolo) was behind her very public embarrassment at Cotillion and can’t pass up a chance to get even. Serena (Blake Lively) is put in a very awkward position when her mother invites Trip (guest star Aaron Tveit) and Maureen (guest star Holley Fain) to join them for Thanksgiving dinner.. The episode was directed by Mark Piznarski directed the episode written by Robert Hull & Joshua Safran. (#311).

A car accident rocks the Upper East Site. On the anniversary of Bart Bass’ death, Chuck (Ed Westwick) wrestles with an issue from the past and a serious car accident rocks the Upper East Side. Dan (Penn Badgley) and Vanessa (Jessica Szohr) attempt to navigate their newly complicated friendship. When Jenny (Taylor Momsen) is accused of beating up one of her classmates, Eric (guest star Connor Paolo) is faced with a tough dilemma. Blake Lively, Leighton Meester, Chace Crawford, Kelly Rutherford and Matthew Settle also star. Jason Ensler directed the episode written by executive producer Stephanie Savage.

Gossip Girl Returns with 10 original episodes!Nate (Chace Crawford) and Serena (Blake Lively) decide to explore the boundaries of their friendship. Blair (Leighton Meester) suspects that Chuck (Ed Westwick) is having problems forgetting about the woman (guest start Laura Harring) he saw at his father’s grave. Jenny (Taylor Momsen) agrees to accompany Damien (guest star Kevin Zegers) to a State Dinner but is unaware that he needs her help with a drug exchange. Vanessa (Jessica Szohr) and Dan (Penn Badgley) attempt to move past the awkardness of Dan’s confession of love. Rufus (Matthew Settle) returns from a ski trip and tries his best to avoid Lily (Kelly Rutherford). Tony Wharmby directed the episode written by Sara Goodman.

Rufus (Matthew Settle) and Lily (Kelly Rutherford) grow suspect of Jenny’s (Taylor Momsen) relationship with Damien (guest star Kevin Zegers). Chuck (Ed Westwick) learns more about the woman (guest star Laura Harring) who may or may not be his mother. Dan (Penn Badgley) and Vanessa (Jessica Szohr) struggle through the awkwardness of dating other people. Andrew McCarthy directed the episode written by Amanda Lasher & Robby Hull.

Damien pressures Jenny to sleep with him. Despite being grounded, Jenny (Taylor Momsen) continues to see Damien (guest star Kevin Zegers) who tells Jenny that he wants to have sex with her. Lily (Kelly Rutherford) tells Rufus (Matthew Settle) that big secret she has been keeping from him even thought she knows it’s a huge risk. Dan (Penn Badgley) and Vanessa (Jessica Szohr) explore a new stage of their friendship. Chuck (Ed Westwick) is forced to make an extremely difficul decision about his hotel. Blake Lively, Leighton Meester and Chace Crawford also star. Wendy Stanzler directed the episode written by Leila Gerstein.

Chuck (Ed Westwick) finds himself once again at odds with his uncle. Jack Bass (guest star Desmond Harrington). Eleanor (Margaret Colin) puts Blair (Leighton Meester) in charge of making sure her latest fashion show is a huge success with an important client. Rufus (Matthew Settle) attempts to get Jenny (Taylor Momsen) back on track by volunteering to have her help with Eleanor’s fashion show, but the opportunity takes a big turn for the worse when Jenny learns that Agnes (guest star Willa Holland) will be one of the models. Blake Lively, Penn Badgley, Chace Crawford, Jessica Szohr and Kelly Rutherford also star. Joe Lazarov directed the episode written by Jake Coburn.

Chuck (Ed Westwick) and Blair (Leighton Meester) are faced with the most difficult decision they have ever faced as a couple. Serena (Blake Lively) plans a surprise birthday party for Nate (Chace Crawford), but Jenny (Taylor Momsen) does her best to sabotage Serena’s efforts. Dan (Penn Badgley) and Vanessa’s (Jessica Szohr) new relationship hits a bump in the road. Matthew Settle also stars. Jean de Segonzac directed the episode written by Lenny Rosenfeld.

Chuck (Ed Westwick) offers to throw a wedding for a very pregnant Dorota (guest star Zuzanna Szadkowski) who insists that she and Vanya (guest star Aaron Schwartz) have a traditional wedding before her parents arrive from Poland and find their daughter pregnant and without a husband. Dorota asks Blair (Leighton Meester) and Chuck to be part of the ceremony and walk her down the aisle. Serena (Blake Lively) tells Nate (Chace Crawford) she is having breakfast with they Humphreys when in reality she’s secretly meeting up with Carter Baizen (guest star Sebastian Stan). Rufus (Matthew Settle) discovers that Lily (Kelly Rutherford) has been lying to him about her whereabouts. Penn Badgley, Taylor Momsen and Jessica Szohr also star. Janice Cooke Leonard directed the episode written by Jeanne Leitenberg.

When Lily’s (Kelly Rutherford) ex-husband Dr. William van der Woodsen (Baldwin), shows up unexpectedly in Manhattan, Serena (Blake Lively) finally gets the reunion she has so desperately wanted with her father, but the circumstances turn out to be far from ideal. When Serena and Nate (Chace Crawford) continue to have relationship issues, a scheming Jenny (Taylor Momsen) is more than happy to be a shoulder for Nate to lean on. Meanwhile, Dan (Penn Badgley) finds out that he didn’t get accepted into the Tisch writing program and Vanessa (Jessica Szohr) admits she may have been somewhat responsible. Leighton Meester, Ed Westwick and Matthew Settle also star. Darnell Martin directed the episode written by Robert Hull.

Will’s (Baldwin) return to the Upper East Side continues to stir up problems for Serena (Blake Lively), Lily (Kelly Rutherford) and his long-standing rival, Rufus (Matthew Settle). Serena and Jenny’s (Taylor Momsen) relationship is strained as a result of Jenny’s deception. Blair (Leighton Meester) spends time on the Columbia campus and realizes where she truly belongs. Dan (Penn Badgley) learns that Vanessa (Jessica Szohr) has been keeping yet another secret from him. Chace Crawford and Ed Westwick also star. Jeremiah Chechik directed the episode written by Amanda Lasher.

When things get tense between Rufus (Matthew Settle) and Will (Baldwin), Serena (Blake Lively) chooses to stand behind her father, while at the Rufus is made to feel like an outsider in his own family. Meanwhile, Jenny (Taylor Momsen) deliberately shares information with Will that may ultimately destroy Lily (Kelly Rutherford) and Rufus’ marriage. After many failed attempts, Chuck (Ed Westwick) makes one last grand gesture to reconcile with Blair (Leighton Meester), hoping she will finally accept the fact that they are destined to be together. Penn Badgley and Chace Crawford also star. Norman Buckley directed the episode written by Sara Goodman.

Blair (Leighton Meester) must decide whether to meet Chuck (Ed Westwick) at the top of the Empire State Building or risk losing their future together. A Gossip Girl gossip bomb involving Dan (Penn Badgley) explodes Serena (Blake Lively) and Nate’s (Chace Crawford) relationship. Dorota (Zuzanna Szadkowski) and Vanya (guest star Aaron Schwartz) welcome their baby. Jenny (Taylor Momsen) hits rock bottom. Georgina (guest star Michelle Trachtenberg) returns to the Upper East Side .. and she has an agenda. Kelly Rutherford and Matthew Settle also star. J. Miller Tobin directed the episode written by Josh Safran and Stephanie Savage.