Tristan Thompson and Khloe Kardashian have sent a cease and desist letter to Kimberly Alexander, a woman claiming that he is the father of her child.

Kardashian lawyer Marty Singer confirmed that the professional basketball player has taken a paternity test that was negative, according to E! News.

When Alexander requested Thompson take second paternity test, Singer said he agreed to it, as long as it was done at an AABB-accredited lab.

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In the cease and desist letter from Kardashian, 35, and Thompson, Alexander is requested to ‘immediately stop defaming them and malicious defamatory lies and specious fabrications.’

The letter was sent to Alexander on Wednesday, just one day after copies of the alleged paperwork from the facility LB Genetics appeared online.

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