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If you thought Christina Aguilera, Pink, Mya and 'Lil Kim's collaboration on "Lady Marmalade" was intense, wait 'til you hear this! "Just Stand Up" will be released on September 2nd, and the song features 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. Whew!

What's even more impressive is all 15 singers will share the stage to perform the song live on September 5 during the "Stand Up to Cancer" television special, which will air on ABC, NBC and CBS.

Other stars to appear in the special include Christina Applegate (who just recently went public with her own cancer battle), Jennifer Aniston, Charlize Theron, Lance Armstrong, Katie Couric, Sally Field, Salma Hayek, Meryl Streep, Forest Whitaker and Reese Witherspoon.

All of the song's sales will benefit cancer research. That's something to sing about!