To celebrate their official coming out as a couple, Blair and Dan host a glamorous British-themed Salon, including guests Julian Tepper and Jenna Gribbon Lola lands the audition of a lifetime, but Gossip Girl may have other plans for the Upper East Side’s latest It Girl.

Nate digs into Diana's past.

Chuck, Nate, Blair, Serena and Lola team up to uncover what they think is an explosive secret between Diana and Jack. Meanwhile, Dan is offered a prestigious fellowship in Rome for the summer.

Blair enlists Serena to be her stand-in at an important meeting when Blair finds herself needing to be in two places at the same time.

In the season finale, Blair chooses between Chuck and Dan.

After an encounter abroad, Blair and Chuck make a promise to each other; Georgina helps Dan write a scathing tell-all book; a search for Serena yields surprising results.

Trying to prove herself in adult society, Serena hosts the Central Park Conservancy’s big gala, of which she is now the newest Board Member, and she and Nate both learn something shocking about their significant others.

Feeling the pressure to make her first Waldorf Designs fashion show a success, Blair must rely on help from an unlikely source, but some unexpected scheming causes a scandal on the runway.

Georgina pushes Dan to choose a worthy person to date to boost his image, but he finds himself drawn in a different direction.

After Eleanor gives Blair an ultimatum, Blair is even more determined to remedy Waldorf Designs’ problems by making a splash with a dress at the upcoming Cotillion, but a shocking revelation at the ball affects everyone.

Unexpected emotions arise as Serena volunteers to help Dan.