If you took the top of the Billboard charts and scooped up just about every huge female star on it, you wouldn't even come close to the lineup for the "Just Stand Up" charity single in support of the Stand Up to Cancer charity. Among the names on the roster are: Mariah Carey, Beyoncé, Mary J. Blige, Rihanna, Fergie, Sheryl Crow, Miley Cyrus, Melissa Etheridge, Ashanti, Natasha Bedingfield, Keyshia Cole, Ciara, Leona Lewis, LeAnn Rimes and Carrie Underwood.

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