Last Night's Look: Love it or Leave it?Check out the head-turning outfits Kim Kardashian, Duchess Catherine and more stars were just spotted in! Then decide – fabulous or fashion fail!

BRITNEY SPEARS

Though co-judge Simon Cowell says Britney is "quite mean" on The X Factor, she looks awfully sweet in this blue sheath featuring an oversize orange paisley print at the show's premiere in L.A.