Credits
PERFORMING ARTISTS
Christina Aguilera
Lead Vocals
Max Martin
Keyboards
Shellback
Programming
Aimee Proal
Background Vocals
COMPOSITION & LYRICS
Max Martin
Songwriter
Savan Kotecha
Songwriter
Tiffany Amber
Songwriter
Karl Johan Schuster
Songwriter
PRODUCTION & ENGINEERING
Max Martin
Producer
Shellback
Producer
Serban Ghenea
Mixing Engineer
John Hanes
Mixing Engineer
Phil Seaford
Assistant Mixing Engineer
Sam Holland
Recording Engineer
Thomas Cullison
Assistant Recording Engineer
Todd Robinson
Assistant Recording Engineer
