Gossip Girl

Blair and Chuck adjust to their new status as a couple and Serena returns from Europe with many secrets to hide and a complicated relationship with Carter Baizen.

It's Blair versus Chuck as they both set their sights on a particular item up for bid at Sotheby's. Plus, Georgina takes an interest in Dan.

It's Jenny's first day as Queen Bee. Plus, a famous actress, Olivia Burke, is assigned as Vanessa's roommate.

Will Lily and Rufus go through with their planned nuptials? Plus, Dan and Vanessa are pulled into one of Georgina's schemes and SONIC YOUTH performs.

Dan invites Olivia to meet Rufus and Lily, which leads to all sorts of problems for the new couple. Serena and Nate team up to help Carter Baizen.

Serena helps Chuck open his club, but Blair feels left out. Dan is unnerved watching one of Olivia's sex scenes with a former co-star. ALBERT HAMMOND JR. performs.

Olivia says something she regrets during an appearance on a talk show with host JIMMY FALLON and tries to keep Dan from finding out.

Jenny sets her sights on landing the hottest escort for Cotillion. Dan is upset when Olivia contemplates leaving school. All-girl French band PLASTISCINES performs.

Dan and Olivia sign up to write and star in a school play, based on an idea by Blair and directed by Vanessa. LADY GAGA performs.

How about an extra serving of holiday drama? Serena is put in an awkward position when Lily invites Tripp and Maureen to join them for dinner.

Chuck wrestles with an issue from the past and a serious car accident rocks the Upper East Side. Dan and Vanessa attempt to navigate their newly complicated friendship.

Chuck tracks the woman he saw at his father's grave. Jenny agrees to help Damien. Nate and Serena get friendly.

Rufus and Lily are suspicious of Jenny's relationship with Damien (KEVIN ZEGERS). Chuck learns more about the mysterious woman.

Jenny contemplates her relationship with Damian. Dan and Vanessa try to define the different "zones" of their relationship.

Rufus volunteers Jenny to help with Eleanor's fashion show, but things take a bad turn when Jenny learns Agnes is one of the models.

Chuck and Blair are faced with a difficult decision as a couple. Serena plans a surprise birthday party for Nate, but Jenny does her best to sabotage Serena's efforts.

Chuck offers to throw a wedding for a very pregnant Dorota. Serena doesn't tell Nate she is secretly meeting up with Carter Baizen.

When Lily's ex-husband Dr. William van der Woodsen, shows up unexpectedly, Serena gets the reunion with her father she has so desperately wanted -- or does she?

Will's return to the Upper East Side continues to stir up problems for Serena, Lily and Will's long-standing rival, Rufus. Dan learns Vanessa has another secret.

When things get tense between Rufus and Will, Serena chooses to stand behind her father, leaving Rufus to feel like an outsider within his own family.

Season finale: Blair decides if she'll meet Chuck at the top of the Empire State Building. A Gossip Girl bomb involving Dan explodes. Georgina returns.