Aaron Tveit

It's Blair's bachelorette party, but others scheme behind her back to ruin the night. After discovering the truth behind Chuck and Blair's car accident, Nate and a surprising ally, gather the evidence. Meanwhile Serena and Dan pretend to be together again to protect someone close to them.

While Lily throws a coming out to society party for Charlie, Serena and Dan try to amend their friendship. It is now time for Blair to choose between Louis and Chuck, she receives help from Dan who has an agenda of his own. Max still tries to leak Charlie's story and at the end of the night she slips Gossip Girl information that could turn deadly.

Lily, Charlie and Serena anticipate a party thrown in CeCe's honor. Nate takes on a new role at the Spectator, and his first big job is of someone he knows very well. Meanwhile, Blair turns to an unlikely source for help.

Lockhart-Gardner takes on the U.S. Government for a military contractor who claims that he was tortured by the army in Afghanistan. While Diane and the team go through boxes of documents, mostly blacked out, Alicia must meet with a government monitor whose authority overrides attorney/client privilege. When counsel reveals damning evidence about the client, Alicia is asked by the monitor to reveal the evidence that would lead to his imprisonment… and if she doesn't, she may have to go to prison herself. So Alicia gets an attorney to help her with the questioning. At the State's Attorney's office, Peter decides to go after Will Gardner, who stole money from a client at his old firm in order to take care of his gambling addiction.

After Peter rescues a woman from a house fire, Megan discovers another person in the house who died. Peter takes the discovery personally since he had no idea anyone else was in the house. A veteran arson investigator challenges Megan at each step in her investigation. When Megan complains to Kate the response she gets only intensifies the tension between the two women.