10/01/2010 AT 06:00 AM EDT
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.
and pregnant wife Miranda Kerr
grabbed a pre-fashion show bite at Paris's Hotel Costes, before the model headed over to the Dior's offices. Meanwhile, Gisele Bündchen
set out for a shopping trip with son Benjamin at the Vanessa Bruno boutique, before heading to the Tuileries.
was also in Paris for Fashion Week
, and the country star took a walk up to the Champs-Elysees, where she stopped in to look at coffemaker Nespresso's luxury coffee bar.
Taking a break from the ballroom, Audrina Patridge
treated herself to a mani-pedi at Nail Garden in Studio City, Calif. The Dancing with the Stars competitor
passed Mila Kunis
in the salon, and the two smiled at each other.
Meanwhile, Bristol Palin
grabbed some R&R in between Dancing with the Stars
practice at Murad Inclusive Health Spa in El Segundo, Calif. She didn't have much time to spare – and checked right in for her appointment.
By JENNIFER GARCIA and PETER MIKELBANK