Gossip Girl

Serena has gone missing and Chuck and Blair make a promise to each other about their relationship. MICHELLE TRACHTENBERG, BARRY WATSON guest star.

Serena hosts a big gala, Blair prepares to debut her new fashion line and Dan must decide if he is willing to sacrifice his integrity in order to get his work published.

Blair relies on help from an unlikely source to make her first Waldorf Designs fashion show a success, but unexpected scheming causes a scandal on the runway. ALEXA CHUNG appears.

Chuck's investigation into his father's dealings leads him to an unlikely event with Manhattan's elite. Serena and Steven (BARRY WATSON) decide to reveal their romantic histories.

Eleanor (MARGARET COLIN) gives Blair an ultimatum, Serena worries about Steven's (BARRY WATSON) attitude toward her and Dan publishes another article.

With Ivy's help, Chuck discovers there is evidence incriminating his father and enlists Nate to help retrieve it. Serena volunteers to help Dan, but unexpected emotions arise.

Serena and Dan decide to make amends with those they have wronged. Chuck is close to getting the evidence he needs against his father, but a close ally reveals his plan.

What's Thanksgiving without a side of drama? Serena and Dan throw their first Thanksgiving together, but everyone seems to have their own agenda.

After a run-in with Bart (ROBERT JOHN BURKE), Blair is concerned for Chuck's safety and devises a plan with Serena, Georgina (MICHELLE TRACHTENBERG) and Sage (SOFIA BLACK-D'ELIA).

Gossip Girl cast and producers look back at the show's many unforgettable moments.

Gossip Girl's identity is finally revealed.