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Stars' Halloween-Worthy Looks

Dressing up like a celeb? See the outrageous outfits of Katy Perry, Nicki Minaj and more – and tell us which one you'd wear Oct. 31!

KATY PERRY

The California Gurl ditched her retro pinup look for futuristic – and sometimes comical – getups this year. From her space-age "Alien" costume to the nerd-girl chic of "Last Friday Night" to her geometric MTV Video Music Awards outfit, Perry always keeps us guessing.