Justin Bieber bared it all at tonight's "Fashion Rocks" event at the Barclays Center. Joining model Lara Stone on stage to introduce Rita Ora, Bieber made things interesting for the women in the audience by stripping down to his boxer briefs. "I actually don't feel comfortable unless I'm in my Calvins," Justin said as he proceeded to disrobe in front of the thousands in attendance. There is no word on if this was an effort to get back in the good graces with female fans he's lost with his bad boy ways this year, but we'd say that the reaction was pretty mixed. Check out the video above.