JUSTIN BIEBER Baby Daddy DNA Test: Pregnant Fan? - (November 2011) After being hit with claims he's a 'baby daddy,' Justin Bieber is taking action. As John Basedow (@JohnBasedow) reports, the Biebs will take a DNA test to prove he is NOT the father of Mariah Yeater's baby when he returns from Europe and then he's going after her in court. According to TMZ sources, Team Bieber thinks a lawsuit is important here to show there are consequences to creating bogus, harmful allegations against a celebrity.