Whether for a role or for fun, Rooney Mara in known for her chameleon-like beauty transformations (see: micro bangs and mohawk braids). None of these beauty experiments have led her far from the brunette trail however, until now. The 31 year-old actress just joined the ranks of fellow A-list beauties Emma Stone, Taylor Swift and Kristen Stewart when she stepped out in LA with platinum-blonde locks tucked under a beanie. If her past forays have taught us anything, she’s going to nail this new look with aplomb. Watch this space.