Will Kourtney Kardashian give in and take a paternity test?
Model Michael Girgenti has been claiming for weeks that he has a decent chance of being Mason's father.
He says he and Kourtney had unprotected sex in March 2009, when she was on a break from beau Scott Disick.
Now Michael is taking his case all the way to… the post office. That's right, he wrote Kourtney a letter demanding a DNA test- or else!