Leona Lewis has recorded a charity song with Mariah Carey and Beyonce Knowles.The British star has teamed up with 14 of the world's top female singers other top female singers - including Rihanna, Fergie and Sheryl Crow - for 'Just Stand Up' for the Stand Up To Cancer Charity, which will be released to download from September 2.The super-group will perform the track on stage for in the Stand Up To Cancer benefit show, which is set to air simultaneously on three US television networks - ABC, NBC and CBS - on September 5.The full list of artists appearing on the track are: Leona Lewis, Mariah Ca...

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