Birthday is a song recorded by American singer-songwriter Katy Perry, released as the fourth single from her fourth studio album, Prism (2013).
Music video was directed by Marc Klasfeld and Danny Lockwood, produced by Dawn Rose.
The song was written by Perry along with Bonnie McKee and produced by Dr. Luke, Max Martin, and Cirkut.
Prism is the fourth studio album by Katy Perry, released on October 18, 2013 by Capitol Records.
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