Backing Vocals – Bonnie McKee, Lukasz Gottwald, Max Martin, Myah Marie, Patrizia Rogosch, Sam Holland, Stacey BarnettCoordinator [Production Coordination] – Clint Gibbs, Irene RichterEngineer – Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Aniela Gottwald*Engineer [Mix] – John HanesInstruments, Programmed By – Alexander Kronlund, Billboard, Dr. Luke, Max MartinMixed By – Serban GheneaProducer – Billboard, Dr. Luke, Max MartinProducer [Vocals] – Emily WrightWritten-By – Alexander Kronlund, Kesha Sebert, Lukasz Gottwald, Max Martin

Backing Vocals – Bonnie McKee, Myah MarieCo-producer – BillboardCoordinator [Production Coordination] – Irene Richter, Megan DennisEngineer – Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Vezna GottwaldEngineer [Mix] – John HanesInstruments, Programmed By – Billboard, Dr. Luke, Max MartinMixed By – Serban GheneaProducer – Dr. Luke, Max MartinWritten-By – Bonnie McKee, Lukasz Gottwald, Mathieu Jomphe, Max Martin

Backing Vocals – Bonnie McKee, Myah MarieCoordinator [Production Coordination] – Clint Gibbs, Irene RichterEngineer – Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Tatiana GottwaldEngineer [Mix] – John HanesMixed By – Serban GheneaProducer [Additional Vocal Production] – Emily WrightProducer, Instruments, Programmed By – Billboard, Dr. Luke, Max MartinWritten-By – Bonnie McKee, Jacob Kasher Hindlin*, Lukasz Gottwald, Mathieu Jomphe, Max Martin

Backing Vocals – Chau PhanEngineer [Assistant Mix] – Tim RobertsEngineer [Mix] – John HanesGuitar, Bass – Shellback Mixed By – Serban GheneaProducer, Recorded By, Keyboards – Max Martin, Shellback Written-By – Max Martin, Savan Kotecha, Shellback

Backing Vocals – Bonnie McKee, Nicole MorierEngineer – Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Eric EylandsEngineer [Mix] – John HanesMixed By – Serban GheneaProducer [Vocals] – Bloodshy, Emily Wright, Henrik Jonback, Magnus*Producer, Instruments – Bloodshy, Henrik Jonback, Magnus*Written-By – Bonnie McKee, Christian Karlsson, Henrik Jonback, Magnus Lidehäll, Nicole Morier, Pontus Winnberg

Backing Vocals – Ammo , Benny Blanco , Bonnie McKee, Crystal "Cri$tyle" Johnson*, Esther Dean*, JMIKE, Myah MarieCoordinator [Production Coordination] – Clint Gibbs, Irene RichterEngineer – Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Eric Eylands, Jeremy "J Boogs" Levin*Engineer [Mix] – John HanesFeaturing – Sabi Mixed By – Serban GheneaProducer [Vocals] – Emily WrightProducer, Instruments, Programmed By – Ammo , Benny Blanco , Billboard, JMIKEWritten-By – Benjamin Levin, Esther Dean*, Jeremy Coleman, Joshua Coleman, Mathieu Jomphe

Backing Vocals – Bonnie McKee, Sophia BlackCoordinator [Production Coordination] – Clint Gibbs, Irene RichterEngineer – Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Tatiana GottwaldEngineer [Mix] – John HanesMixed By – Serban GheneaProducer [Additional Vocal Production] – Emily WrightProducer, Instruments, Programmed By – Dr. Luke, Dream Machine , Max MartinWritten-By – Bonnie McKee, Henry Walter, Lukasz Gottwald, Max Martin

Drum Programming [Additional] – DJ AmmoFeaturing, Written-By, Producer, Drum Programming, Piano – Will.i.am*Mixed By – Dylan "3D" Dresdow*Recorded By, Engineer – Padraic "padlock" Kerin*, Will.i.am*Synthesizer – DJ Ammo, Will.i.am*

Backing Vocals – Ashton Foster, Heather Bright, Livvi Franc, Myah MarieEngineer [Assistant Mix] – Tim RobertsEngineer [Mix] – John HanesMixed By – Serban GheneaProducer, Keyboards, Drum Programming – Fraser T SmithRecorded By – Beatriz ArtolaRecorded By [Vocal Recording Assistant] – Eric EylandsWritten-By – Fraser T Smith, Heather Bright, Livvi Franc

Backing Vocals – Nicole MorierEngineer – Chris 'TEK' O'Ryan*, Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Eric EylandsEngineer [Mix] – John HanesMixed By – Serban GheneaProducer [Vocals] – Bloodshy, Emily Wright, Henrik Jonback, Magnus*Producer, Instruments, Programmed By – Bloodshy, Henrik Jonback, Magnus*Written-By – Christian Karlsson, Henrik Jonback, Magnus Lidehäll, Nicole Morier, Pontus Winnberg, Sophie Stern

Backing Vocals – Bonnie McKee, Claude Kelly, Myah Marie, Sophia BlackCoordinator [Production Coordination] – Clint Gibbs, Irene RichterEngineer – Emily Wright, Sam HollandEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Aniela Gottwald*, Eric Eylands, Jeremy "J Boogs" Levin*, Rob MurrayEngineer [Mix] – John HanesMixed By – Serban GheneaProducer [Vocals] – Emily WrightProducer, Instruments, Programmed By – Benny Blanco , Dr. LukeWritten-By – Benjamin Levin, Bonnie McKee, Claude Kelly, Emily Wright, Lukasz Gottwald

Backing Vocals – Chau PhanEngineer [Assistant Mix] – Tim RobertsEngineer [Mix] – John HanesGuitar – Shellback Mixed By – Serban GheneaProducer, Recorded By, Keyboards – Max Martin, Shellback Written-By – Max Martin, Shellback , Tiffany Amber

Backing Vocals – Bonnie McKeeEngineer – Emily WrightEngineer [Assistant Mix] – Tim RobertsEngineer [Mix] – John HanesMixed By – Serban GheneaProducer – Max Martin, Oligee, Shellback Recorded By – Max Martin, Shellback Written-By – Max Martin, Savan Kotecha, Shellback

Backing Vocals – Britney Spears, Ina Wroldsen, Michaela ShilohEngineer [Assistant Mix] – Tim RobertsEngineer [Assistant] – Eric WeaverEngineer [Mix] – John HanesGuitar – Brent PaschkeMixed By – Rodney Jerkins, Serban GheneaProducer, Producer [Vocal Production], Music By – Rodney "Darkchild" Jerkins*Recorded By – Mike "Handz" Donaldson*, Orlando Vitto, Tony MardiniWritten-By – Ina Wroldsen, Rodney Jerkins

Backing Vocals – Jeanette Olsson, Thaddis "Kuk" Harrell*Engineer [Assistant Mix] – Tim RobertsEngineer [Mix] – John HanesInstruments – Mikkel S. Eriksen, Sandy Vee, Sandy Vee, Tor Erik HermansenManagement [Stargate] – Danny D.*, Tim Blacksmith Mixed By – Serban GheneaProducer – Sandy Vee, Stargate Producer [Vocals] – Kuk HarrellRecorded By – Mikkel S. Eriksen, Miles Walker, Sandy VeeRecorded By [Vocals] – Josh Gudwin, Kuk HarrellWritten-By – Esther Dean*, Mikkel S. Eriksen, Sandy Wilhelm, Tor Erik Hermansen, Traci Hale

Backing Vocals – Britney Spears, Michaela ShilohBass – Thaddaeus TribbettDrums [Live] – Travis BarkerEngineer [Assistant Mix] – Tim RobertsEngineer [Mix] – John HanesGuitar – Brent PaschkeMixed By – Rodney Jerkins, Serban GheneaProducer, Producer [Vocal Production], Music By – Rodney "Darkchild" Jerkins*Recorded By – Mike "Handz" Donaldson*, Orlando Vitto, Tony MardiniRecorded By [Live Drums] – Chris HolmesWritten-By – Michaela Shiloh, Rodney Jerkins, Thomas Lumpkins