Last Night's Look: Love It or Leave It?We can't stop talking about Kristen Stewart's underwear-baring ensemble, Jessica Lowndes's sexy LBD and more outfits that stars were just spotted in. Check them out, then vote – fashion-forward or fashion fail?

JESSICA LOWNDES

The actress's LBD gets a shot of sexiness via a waist cutout and gold trim at the arm holes. She adds a pop of color with a bold red pout and matching cross-body for the Fashion Rules Exhibition launch party in London.