Male model Michael Girgenti recently went public with allegations he had unprotected sex with the socialite in 2009 after meeting her on a photoshoot while she was on a break from Disick.
Girgenti suggested the reality Tv star's son Mason, now three, was born nine months after their fling, and he demanded a Dna test in a bid to find out whether he is the boy's father.
He filed a lawsuit at Los Angeles County Superior Court earlier this month (Aug13), asking for joint custody of Mason.
However, Disick has now taken a paternity test to prove Girgenti wrong, and Kardashian, who denied the affair, is relieved to finally put the drama to bed.
A statement issued to E! News reads: "After three-and-a-half years of rumours and lies being spread by an individual I met briefly at a photo shoot, I am setting the record straight that Scott is Mason's father. While it saddens me to have to address these ridiculous lies - especially when the truth was never in doubt - this story must be put to rest."
In addition to Mason, Kardashian and Disick also have a one-year-old daughter, Penelope.