17 Celebrities in Their Underwear ... Because the Days Are Long and the Nights Are Lonely

We would like to thank these 19 celebrities for their service to this great nation

JUSTIN BIEBER

A highly underrated Bieber-in-his-underwear moment is his "I'll Show You" music video, in which he frolics amongst glaciers. And, yes, we have a file folder titled "Bieber-in-his-underwear moments."