Videos have emerged of Tristan Thompson allegedly cheating on Khloe Kardashian

While Khloe Kardashian is reportedly giving birth as we speak, another scandal is rocking the reality family's household.

Overnight, footage has emerged showing the 33-year-old 'Keeping Up With The Kardashians' star's boyfriend, Tristan Thompson, cheating on her.

The 27-year-old NBA star was reportedly spotted kissing a mystery woman while partying at a rooftop club in New York.

The videos, which were filmed last weekend, appear to show Tristan getting cozy with a brunette woman following reports he was "making out with" the unidentified woman the whole time he was at the club.

And now TMZ have published footage of Tristan and the mystery woman arriving at his team's hotel early the next morning.

She was reportedly photographed the next night, leaving the building with what appears to be an overnight bag.

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The celebrity news website has also shared surveillance video from October 2017 that shows Tristan Thompson kissing two women at a hookah lounge outside Washington DC.

The couple - who are expecting a baby girl - have yet to acknowledge the video.