If blondes have more fun, why are beauties like Demi Lovato and Jessica Biel ditching their light locks in favor of more mysterious dark shades? You might say these lovelies are reviving a hair trend, as Celebuzz has noticed that going brunette is a long-held Hollywood tradition. Just look at famous blondes like Hilary Duff and Mandy Moore, both of whom have opted for bold brunette hues and have yet to look back. Check out the photos of Demi and 11 more Celebs Who Went Brunette and tell us in the comments - who's your favorite blonde-to-brunette star?