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Drums
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Ali Payami
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Performer
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Electric Bass
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Ali Payami
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Performer
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Lyricist
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Max Martin
Savan Kotecha
Katy Perry
Ali Payami
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Composer
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Background Vocals
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Max Martin
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Performer
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Recording Assistant
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Cory Bice
Jeremy Lertola
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Production
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Remixing
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Monsieur Adi
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Production
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Guitar
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Ali Payami
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Performer
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Horn
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Ali Payami
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Performer
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Keyboard
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Ali Payami
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Performer
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Percussion
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Ali Payami
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Performer
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Primary Artist
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Katy Perry
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Main Performer
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Strings
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Max Martin
Ali Payami
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Performer
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Composer
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Ali Payami
Katy Perry
Savan Kotecha
Max Martin
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Composer
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Performer
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Max Martin
Ali Payami
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Performer
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Trumpet
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Max Martin
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Performer
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Mixing
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John Hanes
Serban Ghenea
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Production
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Producer
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Ali Payami
Max Martin
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Production
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Programming
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Max Martin
Ali Payami
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Production
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Recording
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Sam Holland
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Production
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Studio Personnel
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Sam Holland
John Hanes
Monsieur Adi
Jeremy Lertola
Cory Bice
Serban Ghenea
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Production
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Composer Lyricist
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Max Martin
Savan Kotecha
Katy Perry
Ali Payami
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Other