Nicole Richie in One-Shoulder Marchesa Gown

Over the weekend, the stars got all dolled up and attended LACMA's gala for its new "Unmasking: The Lynda & Stewart Resnick Exhibition." While Molly Sims and Nicky Hilton opted for short frocks, the rest — Nicole Richie, Olivia Wilde, Kim Kardashian, Teri Hatcher, and Monet Mazur — made an entrance in floor-length gowns. Olivia went nude, Kim chose red, Teri black, Monet did shimmery turquoise, while Nicole opted for a dramatic Marchesa. Click through to see them all up close, then vote on whose look is most Fab.