Mariah Carey
Beyoncé Knowles
Keyshia Cole
Mary J. Blige
Rihanna
Carrie Underwood
Fergie
Sheryl Crow (only on studio version)
Melissa Etheridge (only on studio version)
Leona Lewis
Natasha Bedingfield
Miley Cyrus
LeAnn Rimes (only on studio version)
Ashanti
Ciara
Nicole Scherzinger (only on live version)