Ellen DeGeneres Will Not Co-Host 'Idol Gives Back'

LOS ANGELES, Calif. -- Access Hollywood has learned that Ellen DeGeneres will not be co-hosting the "American Idol" charity event, "Idol Gives Back," this year.

An inside source tells Access the talk show host is backing out of the charity event due to an unforeseen production schedule that conflicts with her show. The show was scheduled to tape this coming Sunday, April 6th.

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"Idol Gives Back" will include an impressive roster of talent including U2's Bono, Brad Pitt, Reese Witherspoon, Miley Cyrus, Mariah Carey, Eli and Peyton Manning, Fergie, Chris Daughtry, Carrie Underwood, Annie Lennox, John Legend, Snoop Dogg, Maroon 5, Heart, Gloria Estefan, Celine Dion, Robin Williams, and "High School Musical" stars Ashley Tisdale and Vanessa Hudgens.

This year, monies raised will go to the Children's Defense Fund, The Global Fund to Fight AIDS, Tuberculosis and Malaria, Make It Right, Malaria No More, Save The Children, and the Children's Health Fund.

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No word on a replacement host to join Ryan Seacrest for the charity special, set to air April 9 on Fox.