Hervé Léger's sexy black slash dress has made it onto the bodies of not one but two two hot celebs. Heather Graham first wore it at The Hangover premiere in Ireland, with black sandals, a simple necklace, and a black clutch. The Hills's newest cast member Kristin Cavallari also donned Léger's black slash dress at the Wizard of Oz exhibition in LA yesterday. She finished her look off with nude peep-toe pumps and gold bangles. Both ladies bring sexy back, but which version rocks your world?