Can't we all just get along? Yeah...we didn't think so. But, really, what fun would it be if all of our favorite celebrities simply sat around braiding each other's hair and singing "Kumbya," anyway? When you're rich and famous, you're bound to make a few enemies, and this year was chock-full of stars who simply couldn't see eye-to-eye. John Mayer's big mouth got him in trouble with ex Jessica Simpson. Katy Perry apparently wasn't a fan of Lady Gaga's music and Beliebers had it out for Kim Kardashian.
With all of this tabloid fodder flying, it's hard to pick the most ferocious feud, so we're turning to you! Vote in our poll after the jump to tell us which feud was the fiercest. (Brush up on the candidates here.)

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