Artist: Katy Perry - Producer: Greg Wells - Mixer: Greg Wells - Background Vocalist: Katy Perry - Vocals: Katy Perry - Background Vocalist: Ferras Alqaisi - Bass Guitar: Greg Wells - Celesta: Greg Wells - Drums: Greg Wells - Harp: Greg Wells - Piano: Greg Wells - Timpani: Greg Wells - Engineer: Al Schmitt - Engineer: Ian MacGregor - Mastering Engineer: Brian Lucey