For Calvin Klein, no less
                                
                                
                                    (Newser) -
                                    Justin Bieber: pop singer, heartthrob,  frequent   troublemaker ,  enemy of the Vatican , and now, Calvin Klein underwear model. Yes, as the  Hollywood Reporter  points out, Bieber is finally being paid to  take   off   his   shirt . Bieber is the face of the My Calvins campaign, which, of course, required him to strip...