Katy Perry -- Birthday (Official) Get "Birthday" from Katy Perry's 'PRISM': smarturl.it/PRISM Official video for Katy Perry's "Birthday" directed by Marc Klasfeld and Danny Lockwood, produced by Dawn Rose. THE PRISMATIC WORLD TOUR coming to you soon: www.katyperry.com/events Follow Katy Perry: www.katyperry.com youtube.com/katyperry twitter.com/katyperry facebook.com/katyperry

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