She was said to have delivered the child in the early hours of Thursday, April 12, 2018.
This is Khloe and Tristan's first child together.
The news comes after a video surfaced online showing Tristan making out with two women at a hookah lounge outside of Washington D.C.
The incident with the women was said to have occurred back in October 2017 when Khloe was only three months pregnant.
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Just five days ago, Thompson was reportedly seen taking a woman back to his New York City hotel.
Khloe and Tristan have been dating for well over a year.