Stars are constantly changing up their look. But sometimes it's not always for the better! Britney Spears is the obvious example of makeovers gone wrong (remember her foray into black hair -- and then no hair at all?). But she's not the only celeb guilty of a bogus beauty blunder. In addition to Jessica Simpson, Mena Suvari, Mandy Moore, and Ashley Olsen many more stars have made the jump from hot to not. For our roster of celeb looks before and after, keep clicking!

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