What to wear on a summer date with a hot guy? Well, according to Blake Lively and Cameron Diaz, it’s Rag & Bone’s Peasant dress. The Gossip Girl star stepped out for dinner with her costar boyfriend Penn Badgley in her blue and white dress last week in N.Y.C., while the California girl hit the streets of West Hollywood with her new guy, British model Paul Sculfor. Both blondes look totally breezy and cool in their blue dresses — why not nab one for yourself on sale? Get it at eluxury.com now for $229, reduced from $325. Tell us: who wears their Rag & Bone dress better? Blake or Cameron?