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Justin Bieber, Instagram

Instagram

Did you forget to pack your swimsuit, Justin Bieber?

Evidently so, or there's a clause in the pop star's Calvin Klein contract that says he can't wear anything but the brand's super-tight boxer-briefs, even while taking a dip in a glacial river.

The 21-year-old recently shared a photo of the daring move's aftermath on Instagram, but judging from Justin's huge smile and mid-high-five pose, he seems pretty pleased to have taken an extra chilly polar plunge while in Iceland. 

In the pic, the "What Do You Mean?" singer flaunts his many tattoos and muscular mid-section, not to mention his nearly see-through undies!

Iceland Review reports Bieber is visiting Fjaðrárgljúfur, South Iceland, which is close to Kirkjubæjarklaustur.

And although Bieber's trip will probably will be over by the time it takes us to learn how to pronounce either of those picturesque places, at least he's happy to share the view.