Get "Birthday" from Katy Perry's 'PRISM': <a href="http://katy.to/PRISM" title="http://katy.to/PRISM" target='_blank'>http://katy.to/PRISM</a><br /> <br /> Katy Perry Complete Collection on Spotify: <a href="http://katy.to/SpotifyCompleteYD" title="http://katy.to/SpotifyCompleteYD" target='_blank'>http://katy.to/SpotifyCompleteYD</a><br /> Katy Perry Essentials on Apple Music: <a href="http://katy.to/AMEssentialsYD" title="http://katy.to/AMEssentialsYD" target='_blank'>http://katy.to/AMEssentialsYD</a><br /> Watch your favorite Katy videos on YouTube: <a href="http://katy.to/MusicVideosYD" title="http://katy.to/MusicVideosYD" target='_blank'>http://katy.to/MusicVideosYD</a><br /> <br /> Follow Katy Perry:<br /> Website: <a href="http://katy.to/WebsiteYD" title="http://katy.to/WebsiteYD" target='_blank'>http://katy.to/WebsiteYD</a><br /> Instagram: <a href="http://katy.to/InstagramYD" title="http://katy.to/InstagramYD" target='_blank'>http://katy.to/InstagramYD</a><br /> Twitter: <a href="http://katy.to/TwitterYD" title="http://katy.to/TwitterYD" target='_blank'>http://katy.to/TwitterYD</a><br /> Facebook: <a href="http://katy.to/FacebookYD" title="http://katy.to/FacebookYD" target='_blank'>http://katy.to/FacebookYD</a><br /> <br /> <br /> Lyric video for Katy Perry’s “Birthday” from ‘PRISM’ produced by Mandy Sellick and directed by Aya Tanimura.<br /> <br /> <br /> Music video by Katy Perry performing Birthday. (C) 2014 Capitol Records, LLC<i class="fa fa-language transViewIcon clickable" title="Translation"></i>
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