Kourteny Kardashian, Mason Paternity Lawsuit UPDATE: Michael Girgenti Destroy Kardashian-Disick Family With DNA Claim

Kourtney Kardashian is facing a paternity lawsuit over her three-year-old son Mason. The alleged father of Kourtney's first born, Michael Girgenti claims that he had unprotected sex with the "Keeping up with the Kardashian" reality star and believes that Mason is his child.

According to RadarOnline.com who obtained the letter dated April 23, Girgenti wrote a letter to Kourtney to take a DNA test for Mason to either confirm or deny his relations to the three-year-old before he gets the courts involved, "I assure you I don't take being a father lightly," he wrote, "I will be a great father to Mason."

"Please take this final request for a DNA test seriously," he concluded, adding: "Because if you don't, I will be forced to take legal action and sue."

 Last week, Girgenti filed paperwork in Los Angeles for joint custody of Mason.

The Letter read:  "My attentions [sic] are not to hurt the family you've created with Scott [Disick]," Girgenti added, "But at the same time, Mason deserves to know the truth."

Early this year, Girgenti told Star magazine, "This is Kourtney's last chance," he said. "My next step will be to take her to court and sue her for a paternity test. I'm tired of not knowing if Mason is my child and I want the constant wondering to end."

A hearing for the paternity suit is set for late August.

MStars News Previously reported:

Kourtney Kardashin is being accused of lying about Mason's true father according to model Michael Girgenti.

In an interview with Star Magazine, Girgenti claims that Scott Disick isn't the father of their young son and wants a paternity test soon, "This is Kourtney's last chance," Michael added, "My next step will be to take her to court and sue her for a paternity test. I'm tired of not knowing if Mason is my child, and I want the constant wondering to end."

Girgenti says that he is not looking for fame, and says because they had unprotected sex in Miami around the time Mason was conceived, he wants to know the truth, "My intentions [sic] are not to hurt the family you've created with Scott [Disick]. But at the same time, Mason deserves to know the truth."

Girgenti says he never heard from the reality star after their 2009 affair, and has tried to contact her on several occasions, but didn't have any luck, "I tried to contact Kourtney via BlackBerry Messenger, with no response," he said. "I also made an attempt to reach her through the media, with no luck, but kept thinking that eventually the truth would come out."

Makes us wonder if Kanye will demand a DNA test as well?