15 of the hottest ladies in the game just performed  the “Just Stand Up” multi-collabo song at the “Stand Up For Cancer ” program.  It was actually fed into the show as they performed from the Fashion Rocks! taping that was going on at the same time. Mariah Carey, Beyonce, Mary J. Blige, Rihanna, Fergie, Sheryl Crow, Miley Cyrus, Melissa Etheridge, Ashanti, Natasha Bedingfield, Keyshia Cole, Ciara, Leona Lewis, LeAnn Rimes and Carrie Underwood all hit the stage.  Check out the video above. Phresh Indeed