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A woman who claims she is Jay-Z's firstborn daughter was disowned by the 51-year-old rap mogul on Tuesday.

La'Teasha Macer claims she confirmed a DNA match to Jay-Z's grandmother through a DNA submission to Ancestry.com. Which only proves she might be related to someone on Jay-Z's grandmother's side -- not necessarily to Jay-Z himself.

According to reports, La'Teasha, who was born in Cambridge, claims her mom met Jay-Z after they were introduced by an aunt.

Their friendship turned sexual, which allegedly resulted in La'Teasha's birth 28 years ago.

La'Teasha responded to skeptics who asked why her mother never pursued a paternity test before La'Teasha turned 18. She claimed her mother was diagnosed with multiple sclerosis.

"I've been quiet for far too long! @jayzfirstdaughter Join me as I tell you my story of living in the shadows of being Jay-Z's daughter in a city where everyone knew he was my father!" She wrote on Instagram.

"How growing up, I watched Multiple Sclerosis take its toll on my mom. Taking my 'fun mom' that I've always known to 24-hour bedridden.

But I kept it all together raising four kids -- including a set of twins while going to school full-time, working two jobs at the prison and the hospital.
#jayzfirstdaughter"
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But Jay-Z laughed off the woman's claims, telling insiders he never heard of the woman or her mother until reports of her claims circulated on social media.

Friends urge the promiscuous rapper to take a paternity test to prevent La'Teasha from making a career out of being "Jay-Z's first daughter."

Jay-Z, real name Shawn Carter, married singer Beyonce Giselle Knowles in 2008. They share three minor children. Jay-Z reportedly has two adult sons from previous sexual liaisons.