Last Night's Look: Love It or Leave It?Check out the head-turning outfits Pippa Middleton, Gwen Stefani and more stars were just spotted in! Then decide – fabulous or fashion fail!

GWEN STEFANI

Menswear really suits the rock star, who steps out in a Calvin Klein Collection two-tone two-piece, a bandeau bra, Neil Lane jewels and, of course, crimson lips at an Audi-sponsored CFDA/Vogue Fashion Fund event in L.A.