Katy Perry -- Birthday (Lyric Video) Download 'PRISM' on iTunes smarturl.it/PRISM Download 'PRISM' on Amazon: smarturl.it/kp_prism_amzon Lyric video for Katy Perry's "Birthday" from 'PRISM' produced by Mandy Sellick and directed by Aya Tanimura. Follow Katy: www.katyperry.com youtube.com/katyperry twitter.com/katyperry facebook.com/katyperry instagram.com/katyperry plus.google.com/+KatyPerry

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