Katy Perry's 'Part Of Me: The Movie' opened in 3D theaters over the weekend.  To honor this California Gurl (and to celebrate 'National Go Braless Day' ) we take you through some of Katy's wackiest bustier costumes!

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Katy Perry becomes a human Hershey Kiss!













Katy Perry's cupcakes for 'California Gurls' video












Katy celebrating her movie release which a movie reel bra!












Katy Perry opens up her 'California Dreams' concert tour with a new twist on peppermint candies!













Katy shoots sparks into the night with an electric bustier for her 'Firework' music video