Gossip Girl [OV]

Gossip Girl heads to the Hamptons as summer comes to a close. Guest stars include author JAY McINERNEY (Bright Lights, Big City), socialite TINSLEY MORTIMER and MADCHEN AMICK.

Blair is thrilled to be dating royalty, but a scheming Chuck has other plans for her. Plus, Serena and Dan agree to keep their recent hookups a secret.

Serena and Dan are forced to deal with their problems while trapped in an elevator during a blackout. Blair and Chuck question the lack of passion in their new relationships.

When Serena notices that Dan has been cozying up to the new girl in school, the ever-loyal Blair and her minions decide to befriend Amanda and sabotage her budding new romance.

Blair decides to sabotage her mother's show at Fashion Week. Dan starts hanging out with Chuck, and learns the hard way that a walk on the dark side always has its risks.

After a fight, Serena wants to get even with Blair -- who dreams of attending Yale University -- and accepts an invitation to visit. Chuck is kidnapped by an elite secret society.

Blair seeks revenge by enticing Chuck to seduce Vanessa. Serena rebels at an important party of Lily's. And Dan and Jenny find out a secret Nate has been hiding from his friends.

Jenny befriends a model (WILLA HOLLAND - "The O.C."), and is encouraged to explore her wild side. Serena is attracted to an artist, Aaron Rose (JOHN PATRICK AMEDORI - "Vanished").

Serena realizes Aaron (JOHN PATRICK AMEDORI) has kept a secret from her. Jenny and Agnes (WILLA HOLLAND) plan a guerilla fashion show. Blair babysits the daughter of a Yale donor.

Dan tries to get close to Bart Bass (recurring guest star ROBERT JOHN BURKE) to possibly write an expose, but things get heated when Chuck finds out. WALLACE SHAWN guest stars.

Blair's favorite Thanksgiving traditions are ruined by her mother's new boyfriend (WALLACE SHAWN). Serena doesn't tell Aaron (JOHN PATRICK AMEDORI) about her past -- but Dan does.

At the annual Snowflake Ball, Blair and Chuck bet they can find ideal dates for each other. Aaron's (JOHN PATRICK AMEDORI) ex-girlfriend (NATALIE KNEPP) shows interest in Dan.

A sudden and tragic event impacts the lives of everyone.

Chuck's uncle, Jack Bass (recurring guest star DESMOND HARRINGTON - "Dexter," "Rescue Me") arrives on the scene. Meanwhile, Jenny returns to school and takes on the mean girls.

Bart's will is read and everyone learns the fate of the Bass empire. Plus, Dan discovers the secret between Rufus and Lily, and must decide what to do with the information.

Which students will be accepted to Yale University? Plus, Chuck pairs up with an unlikely ally in his war with Jack (recurring guest star DESMOND HARRINGTON) over Bass Industries.

Blair comes up with a plan to get revenge on her teacher, Rachel (LAURA BRECKENRIDGE). Chuck wakes up in a hotel and tries to piece together what happened the night before.

The seniors put on a production of "The Age of Innocence." Chuck enlists help from an unlikely source -- his nemesis, Carter Baizen (SEBASTIAN STAN - "Kings," "The Covenant").

Devastated by the recent plot twist in her life, Blair turns her back on her predictable existence in favor of a wilder lifestyle, causing Serena and Chuck to be concerned.

Serena throws Jenny a party for her 16th birthday, but things get way out of control when Poppy Lifton (TAMARA FELDMAN) turns the small gathering into a huge social event.

Serena returns from her trip to Spain with Poppy (TAMARA FELDMAN) and Gabriel (ARMIE HAMMER). Blair makes a secret deal with Nate's grandfather (JAMES NAUGHTON). Dan gets a job.

Georgina (MICHELLE TRACHTENBERG) returns. Chuck and Nate are at a crossroads in their friendship, a result of their mutual interest in Blair. ARMIE HAMMER also guest stars.

Blair pressures Georgina (MICHELLE TRACHTENBERG) to help her in a scheme. Nate and Chuck's rivalry over Blair comes to a head. And Lily hatches a secret plan to help Rufus.

A special flashback to Lily's life in 1980s Los Angeles features guest stars BRITTANY SNOW, KRYSTEN RITTER, ANDREW McCARTHY and NO DOUBT. MICHELLE TRACHTENBERG also appears.

In a season finale rife with cliffhangers, Gossip Girl livens things up at graduation by sending out a shocking and damaging email blast during the commencement ceremony.