The Insider.com

Heidi Klum, Tom Hanks, Rita Wilson and many more rocked the mic right at last night's UNICEF Playlist fundraiser in Hollywood -- a night of fun, frivolity and karaoke!

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The star-studded event (which benefited UNICEF's Schools for Africa Initiative) featured House of Lies' Kristen Bell & Don Cheadle duetting on a ditty, Alcatraz star Parminder Nagra crooning a tender tune, Molly Sims singing Papa Don't Preach and Heidi leading the room (in particular, Tom Hanks) through a Village People sing-a-long. At one point during Y.M.C.A. she shouted, "If you don't know the words, just dance!"

Kristen Bell Talks Sloths, Stripping & House of Lies

Of the event, Don Cheadle said, "[Kristen & I] responded to an invitation from [Showtime president] David Nevins to come out tonight and embarrass ourselves in front of people for charity." His co-star added, "And we're always looking for new ways to embarrass ourselves." But Don wouldn't let Kristen play coy. "She's got pipes," he laughed. "She's a for real singer. I'm just out here screwing around."

Screwing around for the children? Ain't nothing wrong with that!