Carrie UnderwoodDVR alert! Carrie Underwood will return to 'American Idol' for a very special episode of the FOX show, titled 'Idol Gives Back.' The special, an annual tradition on 'Idol,' raises money for several charities including the Children's Health Fund, Feeding America, Malaria No More and Save the Children.

The multi-platinum-selling member of Grand Ole Opry and reigning ACM Entertainer of the Year joins some of Hollywood's biggest stars -- and some of the world's most powerful leaders -- on the show. President Barack Obama, British Prime Minister Gordon Brown, and former U.S. President George W. Bush are all scheduled to appear. They'll be joined by major-league talent including Alicia Keys, the Black Eyed Peas, Josh Groban, Miley Cyrus, Annie Lennox, Mariah Carey, Gwen Stefani, Pink, Celine Dion, Robin Williams, Ben Stiller, Reese Witherspoon, Bono and Robin Williams.

'Idol Gives Back' airs April 21 at 8:00 PM ET on FOX. For more information on the show and the charities it benefits, click here.

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