BILLY BALDWIN (“WILLIAM VAN DER WOODSEN”) RETURNS/ANDREW MCCARTHY DIRECTS THE EPISODE — Blair (Leighton Meester) thinks Cyrus (Wallace Shawn, who does not appear in the episode) may have found a potential loophole in her prenup. Chuck (Ed Westwick) and Georgina (Michelle Trachtenberg) partner up in a scheme, but it has an unpredictable outcome.. Meanwhile, a family crisis brings William van der Woodsen (Baldwin) back to the Upper East Side. Blake Lively, Penn Badgley, Chace Crawford, Kaylee DeFer, Kelly Rutherford and Matthew Settle also star. Andrew McCarthy directed the episode written by Jake Coburn.

DAN’S BOOK IS SHOWCASED BY UPRIGHT CITIZEN’S BRIGADE — Dan (Penn Badgley) feels honored when he learns that Upright Citizen’s Brigade is performing excerpts from his book, Inside. Blair (Leighton Meester) tries to prove Serena’s (Blake Lively) suspicions wrong in order to save their friendship.. On her way out of town, Ivy (Kaylee DeFer) ends up on a collision course with the van der Woodsens. Chace Crawford, Ed Westwick, Kelly Rutherford and Matthew Settle also star. John Terlesky directed the episode written by Amy B. Harris.

NATE THROWS A VALENTINE’S DAY BASH / ST. VINCENT PERFORMS — It’s Valentine’s Day on the Upper East Side and Blair (Leighton Meester) can’t resist playing cupid for someone she loves.. Georgina (Michelle Trachtenberg) is intent on stirring up more drama, so she decides to crash Nate’s (Chace Crawford) Valentine’s Day party. Meanwhile, Serena (Blake Lively) is shocked by something she witnesses at the party.. Penn Badgley, Ed Westwick, Kaylee DeFer, Kelly Rutherford and Matthew Settle also star. Matt Penn directed the episode written by Austin Winsberg.

BLAIR STRUGGLES WITH A DECISION ABOUT HER FUTURE — Blair (Leighton Meester) must make a difficult decision about her future, the consequences of which could hurt those she loves most. Serena (Blake Lively) takes the blame for an incident with Gossip Girl in order to protect someone she loves.. Georgina (Michelle Trachtenberg) smells the scent of scandal and decides to follow its trail. Penn Badgley, Chace Crawford, Ed Westwick, Kelly Rutherford and Matthew Settle also star. David Warren directed the episode written by Matt Whitney.

OMG! GOSSIP GIRL HITS 100 EPISODES! — The much-anticipated 100th episode will open with a musical dream sequence featuring Serena (Blake Lively), Blair (Leighton Meester) and all the men in their lives (Penn Badgley, Chace Crawford, Ed Westwick and Hugo Becker). Also, while Chuck (Ed Westwick) wrestles with the reality that Blair is about to walk down the aisle with Prince Louis (guest star Hugo Becker), the return of Georgina Sparks (guest star Michelle Trachtenberg) might make the royal affair a royal disaster. Kelly Rutherford and Matthew Settle also star. Mark Piznarski directed the episode written by executive producer Joshua Safran.

MONDAY, JANUARY 23

“GOSSIP GIRL” — (8:00-9:00 p.m. ET)
“Father and the Bride” (TV-14) (HDTV)

BLAIR’S BACHELORETTE PARTY/EPISODE DIRECTED BY AMY HECKERLING (“CLUELESS”) — Blair (Leighton Meester) prepares to celebrate her upcoming royal wedding with a bachelorette party, but others scheme behind her back to make this a night to remember. After discovering the truth behind Chuck (Ed Westwick) and Blair’s car accident, Nate (Chace Crawford) joins forces with a surprising ally to gather the evidence. Serena (Blake Lively) and Dan (Penn Badgley) pretend to be dating again to protect someone close to them. Kelly Rutherford and Matthew Settle also star. Amy Heckerling directed the episode written by Peter Elkoff.

Original Air Date: Jan 16, 2012

Blair’s flashbacks reveal the fallout of her and Chuck’s car accident, which Nate realizes may have been caused by foul play. Meanwhile, Lily gets a private eye to locate Charlie; and Vera Wang makes an appearance at Blair’s bridal-dress fitting.

Guest Cast: Vera Wang as herself.

LILY INTRODUCES CHARLIE TO NEW YORK SOCIETY — Lily (Kelly Rutherford) throws Charlie (Kaylee DeFer) a party to officially introduce her to New York society. Meanwhile, Charlie’s ex-boyfriend, Max (guest star. Brian J. Smith), throws a wrench into Charlie’s future as an Upper East Side princess. Dan (Penn Badgley) decides it may be time to tell Blair (Leighton Meester) the truth about his feelings for her. Chace Crawford, Ed Westwick and Matthew Settle also star. Vince Misiano directed the episode written by Amanda Lasher.

EPISODE DIRECTED BY ANDREW MCCARTHY — Lily (Kelly Rutherford), Charlie (Kaylee DeFer) and Serena (Blake Lively) eagerly anticipate the Studio 54 party being thrown in CeCe’s (guest star Caroline Lagerfelt) honor. Nate (Chace Crawford) takes on a new role at the Spectator, but his first big story turns out to be about someone he knows all too well. Blair (Leighton Meester) turns to an unlikely person for help. Penn Badgley, Ed Westwick and Matthew Settle also star. Andrew McCarthy directed the episode written by Natalie Krinsky.

MONDAY, NOVEMBER 21

“GOSSIP GIRL” — (8:00-9:00 p.m. ET)
“All The Pretty Sources” (TV-14) (HDTV)

SERENA PLANS A DREAM BRIDAL SHOWER FOR BLAIR — Serena (Blake Lively) is hard at work planning a dream bridal shower for Blair (Leighton Meester), but it should come as no surprise that Serena has to plant some false information about the shower in order to keep Blair from finding out all the details. Chuck (Ed Westwick) and Dan (Penn Badgley) decide to spend the day together to distract themselves from the fact that they didn’t make the invite list for Blair’s shower. Nate (Chace Crawford) and Serena find a silver bullet in Diana’s (guest star Elizabeth Hurley) war against Gossip Girl, but struggle about whether to use it or not. Kaylee DeFer, Kelly Rutherford and Matthew Settle also star. Cherie Nowlan directed the episode written by Austin Winsberg.