This week, we already obsessed over Elle Fanning's Rodarte look, but had to include it here, too. Leighton Meester ignored the fact that it's winter, which is totally fine with us, and opted for a pink Dior frock with some amazing Pierre Hardy pink and orange striped wedges. Clemence Poesy embodied casual elegance in a denim skirt and Chanel jacket. Carey Mulligan wore a gorgeous floor-length Erdem dress. And Rachel Bilson wore this lovely powder blue Dior number to the William Rast for Target launch. For more, check out Best Dressed 2010.