In the season finale, the girls head to the Hamptons for the wedding of a flamboyant lounge singer, Bobby Fine (guest star Nathan Lane). Meanwhile, Carrie finds a potential suitor in a motorcycle-riding colleague named Berger.
Jack takes his fight directly to the President, as he attempts to force a confession from him that will prove his involvement in the day's events.
Betty meets Matt's mother but things don't go as she expects, while Wilhemina gets creative to solve a cash-flow problem.
Elizabeth and Jay work to keep an historic agreement between Serbia and Kosovo from falling apart; Henry deals with a bizarre encounter with Secretary of Defense Gordon Becker.
Blair puts on a happy face for her 17th birthday party.