Celeb Fashion Hit or Miss?

Vote on this week's styles including Sienna Miller, Julia Roberts and more stars! You decide – are they fashionistas or flops? By Melissa Liebling-Goldberg

Credit: Evan Agostini/AP

Updated: Friday Jun 20, 2008 | 11:40 AM EDT

RACHEL BILSON

The star shows off her slim figure in a white Hervé Léger dress, Lanvin heels and Romanek Los Angeles clutch at the Whitney Art Party in New York.