Others competing in the 20th season of the popular reality show include Olympic gymnast Nastia Liukin, Iraq War veteran Noah Galloway, "Shark Tank's" Robert Herjavec, musician Riker Lynch, Carl's Jr. commercial model Charlotte McKinney, LMFAO's Redfoo, "Hunger Games" actress Willow Shields and actress/showbiz progeny Rumer Willis.
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