Credits

will.i.am: Producer, Drum Programming, Engineer, Synthesizer, Piano, Recording
Magnus: Programming, Producer, Instrumentation
Billboard: Programming, Producer, Instrumentation, Co-Producer
Serban Ghenea: Mixing
Benny Blanco: Programming, Producer, Instrumentation
Bloodshy: Programming, Producer, Instrumentation
Dr. Luke: Programming, Producer, Executive Producer, Instrumentation, Backing Vocals
John Hanes: Mixing Engineer
Max Martin: Programming, Producer, Executive Producer, Instrumentation, Keyboards, Backing Vocals
Nicole Morier: Backing Vocals
Jeri Heiden: Art Direction
Tom Coyne: Mastering
Aniela Gottwald: Assistant Engineer
Dylan Dresdow: Mixing
Jackie Murphy: Creative Director
Padraic Kerin: Engineer, Recording
Tim Roberts: Mixing Assistant
Fran Cooper: Make-Up
Henrik Jonback: Programming, Producer, Instrumentation
Randee St. Nicholas: Photography
Larry Rudolph: A & R
Emily Wright: Engineer, Vocal Producer
Nick Steinhardt: Design, Art Direction
Eric Eylands: Vocal Recording Assistant, Assistant Engineer
Shellback: Guitar, Producer, Keyboards, Recording
Sam Holland: Engineer, Backing Vocals
Chris "TEK" O'Ryan: Engineer
Beatriz Artola: Recording
Alexander Kronlund: Programming, Instrumentation
Clint Gibbs: Production Coordination
Bonnie McKee: Backing Vocals
Irene Richter: Production Coordination
Adam Leber: A & R
Myah Marie: Backing Vocals
Patrizia Rogosch: Backing Vocals
Stacey Barnett: Backing Vocals
Vezna Gottwald: Assistant Engineer
Megan Dennis: Production Coordination
Chau Phan: Backing Vocals
Ammo : Producer, Instrumentation, Backing Vocals, Additional Programming
Sophia Black: Backing Vocals
Ashton Foster: Backing Vocals
Heather Bright: Backing Vocals
Livvi Franc: Backing Vocals
Peter Theo: A & R
Philip Carreon: Hair Stylist
Ryan Supple: Photo Shoot Producer
Dave Thomas: Stylist
Fraser T. Smith: Producer, Drum Programming, Keyboards