Leighton Meester Pictures: Leighton Meester arrives in style at Z100's Jingle Ball 2009 at Madison Square Garden on December 11, 2009 in New York City.
This year's Jingle Ball featured performances and appearances by Adam Lambert, Taylor Swift, John Mayer, Justin Bieber, Kris Allen, Jay Sean, Pitbull, Boys Like Girls and The Fray. The official charity partner for Z100's Jingle Ball is Food Bank for New York City. The group works to end food poverty throughout the five boroughs through its citywide network of approximately 1,000 food assistance programs.
Picture copyright: Janet Mayer / PR Photos