Kardashian is now in Thompson's hometown of Cleveland, Ohio, expecting to give birth at any moment.
In the footage - filmed by club goers and posted on Mail Online, Tristan appears to lean in to kiss the woman.
The source who provided the video said Thompson and the woman were making out all night. Tristan's pics from his eventful outing at PD-D lounge were just released and there's even speculation that he's kissing the mystery woman in one of them.
'They were talking and being around each other all night. Cavaliers forward Tristan Thompson finds himself in the hot seat with the Daily Mail reporting he was seen kissing someone not pregnant with his second baby while at a NY club called PH-D Lounge Saturday night.
Since the start of her romance with Thompson almost two years ago, Khloe Kardashian has been spotted out and about in Cleveland, Ohio on numerous occasions and has expressed many times that she enjoys being in town away from the paparazzi. Kardashian captioned an Instagram photo of Thompson holding her bare baby bump at the time. Another vid popped up shortly after showing Thompson getting frisky with two females at another club back in October, which would put Khloe at around three months pregnant. They were there when I got there and they were part of a big group of friends. It breaks her heart to see the man she loves with someone else.
She joked: "I give her so much advice [that] she's sick of me".
People also aren't shy about leaving non-sympathetic comments for Khloe Kardashian in the middle of the melee, as reported by the Inquisitr. "I have the best job in the world...."
Khloé Kardashan recently hinted that her first baby girl was due any day, and now it has just been claimed that the KUWTK beauty is in actually in the middle of labour.
"Of course I'm a little nervous to go into labour, but I'm trying not to overthink something that literally happens all the time", she added.