Caught in the Act!
09/14/2011 AT 06:00 AM EDT
In the Big Apple, Justin Timberlake had a guys' night out with Diddy and a group of friends at the launch party for the fashion line Love by Isabel Adrian. And it was a late night: Timberlake arrived after 2 a.m., listened to music, drank champagne and danced to house music. "Justin was really letting go and enjoying himself," an onlooker tells us.
Rose McGowan was chatting up Joe Manganiello at W Hotels' Fashion Next party in N.Y.C. Before the actress arrived, the True Blood star worried that she may not remember him, even though they had done a table read together last year. But his fears were unfounded, and the two sipped champagne as they caught up, while checking out a performance by British singer Katy B.
Sean Penn and girlfriend Shannon Costello shared burgers and soda at The Counter in Santa Monica, Calif. The actor was wearing a suit and they were "affectionate towards each other," an onlooker says of their lunch date. Adds the onlooker: "[They were] constantly smiling during conversation."
By PAUL CHI, JENNIFER GARCIA, CARLOS GREER and PETER MIKELBANK