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

KRYSTEN RITTER

Though she's been favoring '50s silhouettes, the Don’t Trust the B– in Apartment 23 star revs up the sex appeal in a formfitting black Reem Acra sheath with a jeweled halter, black Rene Caovilla pumps and a high bun at the ABC upfronts, cohosted by Entertainment Weekly, in N.Y.C.