From the sidewalks of London to the boutiques of Los Angeles, celebs turned up their style dial this week. Leighton Meester promoted her new flick The Roommate, which meant she wore a bunch of new outfits. One of them turned us off, but one turned us way on! Likewise, Jennifer Lopez lent mega shine, Heidi Klum worked color, and Beyoncé proved that just because she's taking a business meeting doesn't mean she turns her fierce-o-meter off. Click through to see our top 10 celebrity looks of the week.