Many cheating rumors are surrounding the Kardashian family.
Kourtney Kardashian was issued with an ultimatum by the male model claiming to be the father of her son Mason prior to him taking the case to court!
The model named Michael Girgenti, wrote an emotional letter urging her to submit to a DNA test.
According RadarOnline.com he wrote: "My attentions are not to hurt the family you've created with Scott. But at the same time, Mason deserves to know the truth."
"I assure you I don't take being a father lightly. I will be a great father to Mason."
He added: "Please take this final request for a DNA test seriously because if you don't, I will be forced to take legal action and sue."
Michael filed paperwork at Los Angeles County Superior Court last week in a bid to get joint custody of her three-year-old child, Mason, and a hearing has been set for next month.
As for the other Kardashian sister Khloe, who attended her sister Kylie Jenner's birthday without her husband Lamar Odom amidst cheating rumors.
Lawyer Polina Polonsky claims that Khloe's husband Lamar Odom had a 6 week affair with her.