Young Hollywood stepped out for one of the hottest parties in New York Thursday night, in vogue and dripping in jewels!

 

Leighton Meester, Emmy Rossum, Maggie Gyllenhaal, Mena Suvari, "Ugly Betty"'s Becki Newton, and more A-list stars attended the launch of Piaget's new Limelight Paris-New York jewelry and timepieces and we were inside the exclusive party, hosted by Vogue and The Whitney Contemporaries.

And Leighton dishes on the thing she hates the most and new gossip girl secrets!