Celebs in Their Underwear

by Antoinette Bueno      6:36 AM PDT, July 07, 2014

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Justin Bieber

Justin Bieber teased a Calvin Klein underwear campaign with this Instagram shot he posted on March 25, 2014, showing off his abs and a black pair of CKs. "What if I do a Calvin Klein campaign? Comment below yes or no," he tweeted.

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