Last Night's Look: Hit or Miss?

Vote on this week's styles, including Kristin Cavallari, Cameron Diaz and more stars! You decide – are they fashionistas or flops?

NICOLE KIDMAN

Also mingling with the Duchess and Duke, the Aussie actress keeps cool in an icy blue custom Elie Saab gown, Cathy Waterman green tourmaline earrings and a Salvatore Ferragamo clutch.