Maggie Gyllenhaal is Pretty for Piaget
Leighton, 22, has been filming for the upcoming season of Gossip Girl, most recently in Chinatown.
Coming off The Dark Knight blockbuster, Maggie, 30, can be seen later this year in Farlanders, opposite John Krasinksi (The Office).
Emmy Rossum, Liv Tyler, and Mena Suvari were also on hand for the event.
10+ more pics of Maggie and Leighton all pretty for Piaget…