On Tuesday, the Daily Mail published a video of Tristan appearing to make out with a mystery brunette at a club in New York City on Saturday.
The Shade Room then posted photos of the 27-year-old Cleveland Cavaliers player and a mystery brunette -- who appears to be the same woman from the club -- walking into the Four Seasons hotel in NYC early Sunday morning. The brunette was caught on camera leaving the hotel hours later with her Louis Vuitton overnight bag.
To make matters worse for Tristan, TMZ posted a surveillance tape on Tuesday of the him making out with one woman and motorboating another at a Washington, D.C. hookah lounge in October 2017, when Khloe was three months along into her pregnancy.
Khloe was absolutely "devastated" when she found out about Tristan's alleged unfaithfulness and "went ballistic," according to multiple reports.
"Khloe was at their home in Cleveland when she found out. She is shell-shocked and beside herself," an insider toldUs Weekly, noting that she was "in total disbelief" given she was ready to deliver their baby any minute.
Although a source close to Tristan told the magazine that "none of his friends are surprised" by the cheating scandal because they "all know he cheats," Khloe is "completely humiliated."
"She has never felt betrayal like this. There's no denying what he has and has been doing," a Khloe friend told Us. "She has no doubt in her mind and the writing is on the wall."
Khloe reportedly wants to return to Los Angeles as soon as possible to be with her friends and family.
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Prior to getting involved with Khloe in September 2016, Tristan dated Jordan Craig, whom he allegedly split from in mid-2016 when she was pregnant with the couple's now 15-month-old son, Prince Oliver.
Khloe, who was previously married to Lamar Odom, confirmed she was expecting her first child in December 2017 following months of reports. Khloe then revealed she was pregnant with a baby girl in March.
Khloe previously called her baby her "greatest dream realized" and gushed about how Tristan treated her like a queen and always made her feel beautiful on Instagram.