Michael Girgenti - Kourtney Kardashian's Baby Daddy ?

While Kourtney Kardashian and boyfriend Scott Disick are overjoyed with their new arrival, a handsome young model named Michael Girgenti has come forward to claim that he - not Scott - may be the daddy of Kourtney's newborn son Mason Dash Disick!

The new issue of Star magazine reports, Kourtney had a fling with the 23-year-old model and aspiring rapper Michael Girgenti, who goes by the stage name of Premo Stallone.

A close friend of the Kardashian sisters confirmed they'd been intimate, saying: "Kourtney hooked up with Michael twice while she and Scott were on the outs. He's definitely been mentioned as a possibility for being the father of her baby."

A rep for Kourtney insists Scott's the dad, but when Star asked Michael if there's a possibility he fathered the baby, Mr. Premo Stallone replied: "You could say that, yeah."

Ahh. Looks like the perfect reputation and relationship might crumble in the near weeks.

Photo of Michael Girgenti below: