Gossip Girl [OV]

The privileged prep school teens on Manhattan's Upper East Side first learn that Serena van der Woodsen (Blake Lively, "The Sisterhood of the Traveling Pants") is back in town the way they learn all the important news in their lives -- from the blog of the all-knowing albeit ultra-secretive Gossip Girl.

In the wake of the scandalous Kiss on the Lips party, Serena receives an ice-cold reception from her best friend, Blair, who reveals that she knows Serena slept with her boyfriend, Nate, before mysteriously running off to boarding school.

As the Upper East Side teens from Constance Billard and St. Jude's prepare for a much-anticipated visit from Ivy League representatives, Blair uncovers scandalous information about Serena that may not remain a secret much longer.

Blair is thrilled when her mother 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 moves into the spotlight, and Blair finds herself back in Serena's shadow.

Dan makes elaborate plans to impress Serena on their first official date. On the same night, Jenny is invited to the infamous Blair Waldorf sleepover and finds herself in a high-stakes game of Truth or Dare.

Dan is torn between two girls when his childhood friend, Vanessa (recurring guest star JESSICA SZOHR), returns home and declares her feelings for him, just as he and Serena are trying to figure out what they mean to each other.

After surviving their relationship's on-again/off-again genesis, Serena and Dan finally acknowledge that they are crazy about each other, despite their polar-opposite worlds that constantly threaten to pull them apart.

Devastated by the state of her relationship with Nate and still dealing with the guilt from a recent indiscretion, Blair puts on a happy face for her 17th birthday party and attempts to hide the truth from her friends.

When Dan finds out that Serena and her family are celebrating Thanksgiving alone, he naively invites them to spend the holiday with his family, creating an uncomfortable situation for Rufus and Lily.

Serena has absolutely no intention of attending the upcoming Debutante Ball, until her grandmother, CeCe (guest star CAROLINE LAGERFELT - "All the King's Men," "Nash Bridges"), announces that Serena must attend.

When Blair's father, Harold (recurring guest star JOHN SHEA), comes home for the holidays with an unexpected guest -- his boyfriend, Roman (guest star WILLIAM ABADIE - "Entourage," "The O.C.," "The Pink Panther") -- Blair finds it difficult to hide h ...

The gang breaks into the school swimming pool for an impromptu night of fun, but when a member of their group nearly drowns, the school threatens to expel the person responsible for the break-in.

Gossip Girl takes pleasure in reporting that Serena van der Woodsen has been spotted buying a pregnancy test, and the word spreads like wildfire.

Blair returns to school after losing Queen Bee status; Serena's not fond of living with her future stepbrother, Chuck; and Jenny does something illegal in her quest for popularity.

Serena's world is turned around when her former partner in crime, Georgina Sparks (MICHELLE TRACHTENBERG - "Buffy the Vampire Slayer"), returns to Manhattan to stir up trouble.

Blair and Jenny escalate their "popularity war" by spreading scandalous rumors about each other through Gossip Girl. One of the Upper East Side teens reveals that he's gay.

Georgina (recurring guest star MICHELLE TRACHTENBERG) reveals the true reason that Serena fled Manhattan for boarding school, and Serena quickly falls back into her old habits.

With Serena's reputation on the line, Blair takes matters into her own hands to deal with manipulative Georgina (recurring guest star MICHELLE TRACHTENBERG). Lily thinks of Rufus.