What would it sound like if 15 of the hottestfemale singers joined voices? The answer will be revealed on Sept. 2, when "Just Stand Up" hits airwaves and iTunes. Mariah Carey, Beyonce, Mary J. Blige and Rihanna are among the group of singers who will perform their single, which will benefit cancer research, during the Sept. 5 program.
(Photo: AP Photo/Chris Pizzello)
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