Last Night's Look: Love It or Leave It?We can't stop talking about Fergie's high-slit gown, Miley Cyrus's gold crop top and more outfits that stars were just spotted in. Check them out, then vote – fashion-forward or fashion fail?

KATY PERRY

Also stepping out for Britney's big night in Vegas, Katy wears a sequined Unif No Nu Frenz T-shirt dress over a white tulle mini and accessorizes with thigh-highs, chunky black boots and a Chanel backpack.