Nick Jonas strips to his underwear on Running Wild With Bear Grylls

The episode which aired on Monday night showed the 23-year-old pop star bravely crossing a frozen lake - but not before stripping down to his boxer-briefs.

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Nick Jonas Strips Down to His Underwear on 'Running Wild With Bear Grylls

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Nick Jonas strips to his underwear on Running Wild With Bear Grylls

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Nick Jonas strips to his underwear on Running Wild With Bear Grylls