(2 of 8) Blonde to BrunetteWho says blondes have more fun? These gorgeous stars are crossing over to the dark side and loving every minute of it! Whether going from platinum blonde to dark chestnut like Britney Spears, or keeping it more subdued like Keira Knightley, they all showed their true colors—as brunettes, of course! Scarlett Johansson Johansson took the plunge and went dark for her role in The Nanny Diaries, in which she plays a college student turned nanny who goes to work for a demanding New York family and their bratty child.
