Funnyman Chris Rock isn't laughing about one woman's claims he fathered her son.

The comedian has been hit with DNA demands from a woman who insists her teenager is Rock's love child.

Kali Bowyer, 35, insists her alleged ex-boyfriend's DNA will help in determining why her 13-year-old son, Jordan, suffers from seizures.

She tells the National Enquirer, "From the time Jordan was born until he was three, I was talking to Chris' lawyer, trying to get this resolved, but I kept getting brushed off.

"I complied, I was nice, and I was patient, but in the end Chris still refused to acknowledge paternity.

"I don't want a dime for myself but support for my son... He knows what's going on (and) he told me... 'I don't need him in my life, just take the test so I can find out what's wrong with me.'"

Bowyer, who briefly dated Rock in the early 1990s when she was at college in Los Angeles and the funnyman was an aspiring comedian, insists she's not out to upset her ex's family life or his marriage to wife Malaak.

She adds, "Take five minutes, tell your wife you're out for a cup of coffee, go to the doctor's office and get the DNA test done."