Kelly Clarkson, Jim Parsons, Chelsea Handler Sign on for TLC's 'Who Do You Think You Are?' Revival (Video)

TLC has racked up an impressive list of celebrities willing to dig into their family's history for all to see when it begins airing the eight-episode fourth season on Tuesday, July 23 at 9/8c.

"American Idol" champ Kelly Clarkson, "The Big Bang Theory" star Jim Parsons, E!'s late night host Chelsea Handler, movie star Chris O'Donnell and country singer Trisha Yearwood will appear on the show's upcoming season on the cable channel.

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