Playing someone who isn't yourself is already mental gymnastics - but adding the extra layer of portraying a famous actor might make your head spin. Keep reading to see which stars have transformed into Hollywood icons in various big-screen projects... MORE: Follow Wonderwall on MSN for more top news Lily Collins will play Audrey Hepburn in a new biopoic Nate D. Sanders Auctions/ MEGA/Xavier Collin/Image Press Agency Lily Collins is the latest star to take on that challenge, portraying Audrey Hepburn in a new film about the making of the iconic rom-com Breakfast at Tiffany's.