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.

Nick Jonas strips down to his underwear (in the snow!) on Running Wild with Bear Grylls - 9Celebrity

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Nick Jonas Strips To Undies on Running Wild With Bear Grylls

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Watch Nick Jonas and Bear Grylls Swim Across an Ice Cold Lake IN THEIR UNDERWEAR

Nick Jonas strips down (to wade a frozen lake) on 'Running Wild with Bear Grylls

my new plaid pants: Armie Au Naturel