Gossip Girl

Chuck and Nate visit Serena in Los Angeles and attend a glamorous Hollywood Hills party where Nate meets a sexy older woman.

Nate reconnects unexpectedly with Diana (ELIZABETH HURLEY), who offers him an exciting opportunity. Blair's future sister-in-law, Beatrice (ROXANE MESQUIDA), arrives from Monaco.

At Diana's (ELIZABETH HURLEY) request, Nate must decide whether to cross moral lines. Chuck helps Dan come to terms with his fate. A Jenny Packham fashion show is featured.

After much thought, Dan decides to gather his friends and family to reveal the truth about his book in the hope that they will support him at his book party.

Serena must choose between her new job and her relationship with Dan. Plus, Diana (ELIZABETH HURLEY) expects Nate to help out when an unexpected surprise delays her launch.

Blair makes her former minions and Charlie compete for the coveted bridesmaid spots in her upcoming royal wedding. Nate uses Charlie to make Diana (ELIZABETH HURLEY) jealous.

Attending a performance of Punchdrunk's provocative theater experience "Sleep No More" can only mean masks, anonymity and some surprising romantic twists. But involving who?

Serena plans a dream bridal shower for Blair, but Chuck and Dan don't make the guest list. Nate and Serena make a discovery in Diana's (ELIZABETH HURLEY) war against Gossip Girl.

Lily, Charlie and Serena eagerly anticipate the Studio 54 party thrown in CeCe's (CAROLINE LAGERFELT) honor. Nate takes on a new role at the Spectator.

Lily throws Charlie a party to officially introduce her to New York society. Meanwhile, Charlie's ex-boyfriend, Max (BRIAN J. SMITH), throws a wrench into her future plans.

Through a series of emotional flashbacks, Blair reveals to Serena what really happened in the aftermath of her tragic car accident with Chuck. VERA WANG appears as herself.

Blair prepares for her bachelorette party. Nate joins forces with a surprising ally to gather evidence about Chuck and Blair's car accident. Serena and Dan pretend to date again.

In the 100th episode, as Blair is about to marry Prince Louis (HUGO BECKER), the return of Georgina Sparks (MICHELLE TRACHTENBERG) might make the royal affair a royal disaster.

Blair struggles to decide about her future and Serena takes the blame for an incident with Gossip Girl in order to protect someone she loves. MICHELLE TRACHTENBERG guest stars.

It's Valentine's Day on the Upper East Side. Georgina (MICHELLE TRACHTENBERG), intent on stirring up drama, decides to crash Nate's Valentine's Day party. ST. VINCENT performs.

Dan's book is showcased by comedy troupe Upright Citizen's Brigade, Blair tries to prove Serena's suspicions wrong and Ivy ends up on a collision course with the van der Woodsens.

Chuck and Georgina (MICHELLE TRACHTENBERG) partner up in a scheme, with an unpredictable outcome. A family crisis brings William van der Woodsen (BILLY BALDWIN) to town.

Chuck invites Jack (DESMOND HARRINGTON) to town, Blair and Dan attempt to consummate their new relationship and Ivy finds an unlikely ally in William (BILLY BALDWIN).

Serena tries to make a reluctant Lola (ELLA RAE PECK) the next It Girl of the Upper East Side, starting with modeling at a Kiki de Montparnasse show. ELIZABETH HURLEY guest stars.

To celebrate being a couple, Blair and Dan host a glamorous British-themed Salon -- with guests JULIAN TEPPER and JENNA GRIBBON. Serena and Diana (ELIZABETH HURLEY) face off.

Lily has a family gathering with William (BILLY BALDWIN), Carol (SHEILA KELLY) and Lola (ELLA RAE PECK). Nate digs into Diana's (ELIZABETH HURLEY) past. Blair's status worries her.

Chuck, Nate, Blair, Serena and Lola (ELLA RAE PECK) team up to uncover what they think is an explosive secret between Diana (ELIZABETH HURLEY) and Jack (DESMOND HARRINGTON).

Serena poses as Blair at an important meeting. Ivy and Lola (ELLA RAE PECK) team up to help Chuck. Nate makes a decision about the future and Diana (ELIZABETH HURLEY).

When Gossip Girl goes after Blair, Serena admits she may have played an important role in Blair's latest nightmare. Plus, will Blair choose Chuck or Dan?