Katy Perry announced through her Twitter account that her fourth single from new album 'Prism' is to be 'Birthday'.
The artwork seen above was also released, and shows Katy and her sister Angela at a table with balloons and a cake photoshopped into the image.
'Birthday' follows 'Roar', 'Unconditionally' and 'Dark Horse' as singles from the October-released album 'Prism'.
Listen to the track below - do you think this will be another major hit for Katy?
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