Olsen makes a splashy style statement at the American Museum of Natural History in N.Y.C. Plus: Paris & Benji, Will Smith, Cameron Diaz and more


Lauren Conrad makes waves on the runway after debuting her fall collection Tuesday at Smashbox Studios in Culver City, Calif., as part of Mercedes-Benz Fashion Week. "I wanted to stick to my California roots," the Hills star told PEOPLE before the show. "It's a great time because I get to take all of my months and months of work and display it for everyone and celebrate what I did. It's where the work pays off."