Parties! The style, stars and scoop from Hollywood's hottest events

Though she looked perfectly put together when she arrived at the premiere of Marley & Me, Jennifer Aniston (in Valentino) worried that she didn't have the must-have accessory of the night. "Did they give those to you here?" Aniston asked the crowd of fans sporting Santa hats for the occasion. The actress was joined by co-star Owen Wilson for the debut of the holiday flick, which hits screens on Christmas Day.

—With reporting by Grace Lee and Lindzi Scharf