Bass – Joshua MoreauGuitar – Matthew Beckley*, Patrick MateraPercussion – Adam MarcelloProducer – Stuart LastWritten-By – Arturo Flores

Bass – Joshua MoreauGuitar – Matthew Beckley*, Patrick MateraPercussion – Adam MarcelloWritten-By – Jesse Rogg, Samuel Falson

Instruments [All] – Ted BrunerMixed By – Ted BrunerRecorded By – Ted BrunerWritten-By – Katy Perry, Ted Bruner

Mastered By – Stephen MarcussenProducer, Recorded By, Mixed By – Ted BrunerWritten-By – Katy Perry

Engineer [Assisted By] – Tim RobertsEngineer [Engineer For Mix] – John HanesMastered By – Bernie Grundman, Brian "Big Bass" Gardner*Mixed By – Serban GheneaProducer, Recorded By – Greg WellsRemix, Producer [Additional], Instruments, Recorded By, Mixed By – Calvin HarrisWritten-By – Andreas Carlsson, Desmond Child, Katy Perry

Backing Vocals – Cathy DennisDrums [Live Drums] – Steven WolfDrums, Programmed By – Benny Blanco , Dr. LukeEngineer – Aniela Gottwald*, Emily Wright, Mike Caffrey, Nick Banns, Sam Holland, Tina KennedyEngineer [Assisted By] – Tim RobertsEngineer [Engineer For Mix] – John HanesGuitar, Bass – Dr. LukeMastered By – Brian "Big Bass" Gardner*Mixed By – Serban GheneaProducer – Dr. LukeProducer [Additional] – Benny Blanco Remix – Dr. Luke, Serban GheneaWritten-By – Cathy Dennis, Katy Perry, Lukasz Gottwald, Max Martin

Engineer – Emily Wright, Nick Banns, Sam Holland, Tatiana Gottwald, Tina KennedyEngineer [Assisted By] – Tim RobertsEngineer [Engineer For Mix] – John HanesMastered By – Brian Gardner, Chris BellmanMixed By – Serban GheneaRemix – Bimbo JonesRemix, Producer [Additional], Keyboards – Lee Dagger, Marc JBWritten-By – Katy Perry, Lukasz Gottwald, Max Martin

Arranged By [Horns] – Jerry HeyHorns – Bill Reichenbach , Dan Higgins, Gary Grant, Jerry HeyMixed By – Joe ZookPiano, Guitar, Bass – Greg WellsProducer – Greg WellsProducer [Additional] – Cory Nitta, DJ Skeet SkeetRecorded By – Drew PearsonRemix – Cory Enemy, DJ Skeet SkeetVocals, Whistle – Katy PerryWritten-By – Greg Wells, Katy Perry