Artist: Rihanna - Producer: StarGate - Featuring: Britney Spears - Producer: Sandy Vee - Recording Engineer: Mikkel S. Eriksen - Recording Engineer: Miles Walker - Producer: Kuk Harrell - Recording Engineer: Kuk Harrell - Recording Engineer: Marcos Tovar - Recording Engineer: Josh Gudwin - Asst. Recording Engineer: Bobby Campbell - Producer: Veronika Bozeman - Mixer: Phil Tan - Additional Mixer: Damien Lewis - Background Vocalist: Ester Dean - Mixer: Phil Tan - Producer: Emily Wright - Recording Engineer: Emily Wright - Asst. Recording Engineer: Eric Eylands