Miley Cyrus by Jamie McCarthy/ WireImage.com, Mariah Carey by Kevin Mazur/TCA 2008/WireImage.com
Get ready for one of the most star-powered charitable single since "We Are the World." Fifteen of the hottest female artists, including Mariah Carey, Rihanna, Beyonce and Miley Cyrus, are joining voices to record the song "Just Stand Up" to benefit the Stand Up for Cancer Fundraising Campaign.

According to Variety, the tune, produced by Kenneth Edmonds and Antonio Reid (better know as Babyface and L.A. Reid), also features singing powerhouses Ashanti, Natasha Bedingfield, Mary J. Blige, Ciara, Keyshia Cole, Sheryl Crow, Melissa Etheridge, Fergie, Leona Lewis, Rihanna, LeAnn Rimes and Carrie Underwood.

"Just Stand Up" will be available on iTunes starting on September 2, and all the ladies will share a stage during a live performance at Stand Up to Cancer telethon set to air simultaneously on ABC, CBS and NBC and September 5. - Gina DiNunno