Tristan Thompson is reportedly expecting his third child.

Khloe Kardashian is NOT the mother.

The NBA player is being sued by a Houston-based personal trainer by the name of Maralee Nichols.

The Daily Mail reports Nichol is suing him for child support despite the child not being born yet.

Per the publication, the child was allegedly conceived on Thompson’s 30th birthday in March when he and Kardashian were still together.

Thompson didn’t deny having sexual relations with Nichols.

In fact, he acknowledged having sex with her several times in a hotel after they attended a party together, according to a declaration included in the filing.

He says this is the ONLY time he was intimate with the personal trainer.

Nichols’ attorneys claim their affair began at least “five months” before his 30th birthday.