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

With just one day to go 'til her show's big premiere, the X Factor judge gets our vote at FOX's Fall Eco-Casino Party in Culver City, Calif., thanks to her embellished nude sheath, black ankle-strap peep-toes, a coordinating Swarovski clutch and a ballerina bun.