Gossip Girl Leighton Meester hosted a bash in Las Vegas, but ditched the usual Sin City glitter. Instead, she opted for classy, and a bit sassy, in her Catherine Malandrino colorblock dress. I'm digging the purple, teal, and black combo! Since her frock isn't available to the masses yet, an alternative is to re-create her look with some similar pieces. Attention: Do try this at home.