Could it be the heat that's convincing celebrities to pull their hair off their necks? Whatever it may be, there were lots of beautiful updos this week. Rachel Bilson opted for a modern, asymmetrical look that accented her pink lipstick. Taking a break from the Olympic celebrations in London, Kate Middleton surprised many by straying from her typical look and swooping her hair into a low bun. And at the premiere of the latest Total Recall remake, Kate Beckinsale opted for a texturized updo with lots of hanging curls. All three women stayed stylish and cool this week, but who wore her updo the best?