June 13, 2011: Gossip Girl Leighton Meester sang at the Troubadour in West Hollywood and fellow Gossip Girl Michelle Trachtenberg stopped by to enjoy the show.

Friday, February 18, 2011: Leighton Meester filming a scene with her 'Gossip Girl' co-stars on the streets of NYC.

Saturday, January 15, 2011: Celebrities flocked to Chateau Marmont for Paramount Pictures Pre-Golden Globes bash. Spotted here are: Jeff Bridges, Melissa Leo, Tilda Swinton, Joaquin Phoenix, Michelle Trachtenberg, Matthew Morrison, Chase Crawford, Dianne Kruger with Josh Jackson, Johnny Knoxville, Leighton Meester, and more!

August 9th, 2010: Leighton Meester was seen filming an epsidoe of the CW hit Gossip Girl in New York on Monday. She wore a colorful dress on set.

March 1st, 2010: The photographers caught up with Leighton Meester and Penn Badgley Monday afternoon in New York City. They were spotted filming an episode of their hit show Gossip Girl.

X17 Xclusive - October 23rd, 2009: Leighton Meester was spotted in New York City Friday afternoon. She was seen walking to and from the set of Gossip Girls.

Co-Stars Leighton Meester and Minka Kelly were seen on the set of their upcoming film "The Roommate" in Hollywood on Tuesday, May 12th.