He's getting social
! After screening his new movie The Social Network
in New York, Justin Timberlake
headed to the Gansevoort Park Avenue, where he celebrated with a rooftop bash. Though girlfriend Jessica Biel
wasn't there, the singer-actor was happy to chat with other party guests, and he spent most of his time in the Red Room. "Justin was really so
low key," a guest says. Before the party, which also drew out Gabourey Sidibe
and Lance Bass
, Timberlake hosted a poolside dinner and hung out at Plunge Bar.