Celebs Sign Up for Idol Gives Back
03/03/2008 AT 12:00 AM EST
Other musicians appearing include Carrie Underwood, Chris Daughtry, Bono, Annie Lennox, Miley Cyrus, Mariah Carey and Snoop Dogg.
Last week host Ryan Seacrest also revealed that Brad Pitt would make an appearance.
Last year's fundraiser earned more than $75 million for charities in the U.S. and in Africa. Kevin Parry/WireImage; Gregg DeGuire/WireImage