�Just Stand Up!� is a song featuring the female vocals of an all-star cast of pop/R&B/hip-hop/rock performers, including Mariah Carey, Beyonc� Knowles, Mary J. Blige, Rihanna, Fergie of Black Eyed Peas, Sheryl Crow, Nicole Scherzinger of ~Censored~ Cat Dolls, Natasha Bedingfield, Miley Cyrus of Hannah...