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!

DEMI LOVATO

Britney's X Factor tablemate ditches her spikes, leather and denim for a totally ladylike cap-sleeve dress, orange-red lips, Open Hearts by Jane Seymour jewelry and platform pumps at the show's L.A. premiere.