Nick Jonas strips to his underwear to cross an ice-cold lake

Nick Jonas is the latest celebrity to appear on Running Wild with Bear Grylls.

The singer can be seen stripping down to his Calvin Klein boxers to cross an ice-cold lake through the Sierra Nevada Mountains with the TV adventurer. Brrr… rather you than us, Nick!

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In a clip for the episode, Jonas can be heard saying, “My toes are freezing.”

“It’s crazy what happens to your body, the instincts that kick in. You have to go, push yourself.”

The Jealous singer also cooks bird guts on his journey with Grylls….. Again, rather you than us, Nick!

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