Composer: Catherine Dennis & Łukasz Gottwald & Katy Perry & Max Martin
Lyricist: Catherine Dennis & Łukasz Gottwald & Katy Perry & Max Martin
Composer: Walter De Backer
Lyricist: Walter De Backer
Composer: Carl Falk & Rami Yacoub & Savan Kotecha
Lyricist: Carl Falk & Rami Yacoub & Savan Kotecha