(3 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! Alicia Silverstone Would Cher Horowitz approve? Silverstone, best known for her role in Clueless, leaves her past behind and tries out a deep brown hue.