Mariah Carey, Beyonce and Carrie Underwood are just three of the 15 lovely ladies lending their voices to the fight against cancer.

The single "Just Stand Up," which also features Mary J. Blige, Rihanna, Fergie, Sheryl Crow, Miley Cyrus, Melissa Etheridge, Ashanti, Natasha Bedingfield, Keyshia Cole, Ciara, Leona Lewis and LeAnn Rimes, will hit the airwaves as well as ITunes on September 2 and all proceeds will go towards cancer research.

Then on September 5 the A-list group will unite on stage to sing the song live during the "Stand Up To Cancer" TV special, set to air simultaneously on ABC, CBS and NBC.