Artist: Katy Perry

Vocals: Katy Perry - Drums: Dr. Luke - Keyboards: Dr. Luke - Producer: Dr. Luke - Programmer: Dr. Luke - Drums: Benny Blanco - Keyboards: Benny Blanco - Producer: Benny Blanco - Programmer: Benny Blanco - Drums: Max Martin - Keyboards: Max Martin - Producer: Max Martin - Programmer: Max Martin - Recording Engineer: Emily Wright - Recording Engineer: Sam Holland - Asst. Recording Engineer: Tucker Bodine - Asst. Recording Engineer: Tatiana Gottwald - Mix Engineer: Serban Ghenea - Mix Engineer: John Hanes - Assistant Mixer: Tim Roberts - Production Coordinator: Irene Richter - Production Coordinator: Vanessa Silberman - Production Coordinator: Megan Dennis - Music Production: Vandalism - Re-Mixer: Vandalism

Vocals: Katy Perry - Drums: Dr. Luke - Keyboards: Dr. Luke - Producer: Dr. Luke - Programmer: Dr. Luke - Drums: Benny Blanco - Keyboards: Benny Blanco - Producer: Benny Blanco - Programmer: Benny Blanco - Drums: Max Martin - Keyboards: Max Martin - Producer: Max Martin - Programmer: Max Martin - Recording Engineer: Emily Wright - Recording Engineer: Sam Holland - Asst. Recording Engineer: Tucker Bodine - Asst. Recording Engineer: Tatiana Gottwald - Mix Engineer: Serban Ghenea - Mix Engineer: John Hanes - Assistant Mixer: Tim Roberts - Production Coordinator: Irene Richter - Production Coordinator: Vanessa Silberman - Production Coordinator: Megan Dennis - Music Production: Philip Larsen - Re-Mixer: Philip Larsen - Programming: Philip Larsen - Music Production: Chris Smith - Re-Mixer: Chris Smith - Programming: Chris Smith