Olsen turns out for a rockin' rooftop party in New York City. Plus: Gwen Stefani, Prince Harry, Shannen Doherty and more

HAVING A BALL

She may be training for Dancing With the Stars, but Olympic gold medalist Misty May-Treanor has found a happy medium, combining her primary passion (volleyball!) with her glitzy new gig during a video shoot Thursday on the Santa Monica beach.