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.
Nick Jonas strips down (to wade a frozen lake) on 'Running Wild with Bear Grylls
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Nick Jonas strips to his underwear on Running Wild With Bear Grylls
Nick Jonas strips to his underwear to cross an ice-cold lake
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Nick Jonas strips to his underwear on Running Wild With Bear Grylls
