The original American Idol, Kelly Clarkson, along with Hugh Grant, Keira Knightley, Forest Whitaker, Helena Bonham Carter, Daniel Radcliffe, Teri Hatcher and Mr. Bean (Rowan Atkinson), are scheduled to appear on Idol Gives Back, a two-night special airing Tuesday, April 24 (8:00-9:00 PM ET/PT) and Wednesday, April 25 (8:00-10:00 PM ET live/PT tape-delayed) on FOX.

Idol Gives Back will raise awareness and funds for organizations that provide relief programs to help children and young people in extreme poverty in America and Africa.

These celebrities join previously announced talent including Gwen Stefani, Josh Groban, Pink, Michael Buble, Annie Lennox, Il Divo and Borat Sagdiyev.

On Tuesday, April 24 (8:00-9:00 PM ET/PT), the Top 6 finalists will sing songs that can be considered "life anthems." After the performance show, viewers will vote for their favorite contestants via toll-free numbers and text messages, as usual. On this special night, for every vote cast, sponsors will donate money to the charity.

The special two-hour results show on Wednesday, April 25 (8:00-10:00 PM ET live/PT tape-delayed) will be a star-studded evening featuring live performances from the American Idol stage as well as the Walt Disney Concert Hall in Los Angeles. Viewers will be able to make their own donations via toll-free pledge lines and the Internet.

-American Idol Pictures