During a birthday dinner for her sister Kourtney, he told his wife that he had found a video of her on an adult website and, while he found the whole thing rather funny, his wife was horrified at the discovery.
The video, which shows 29-year-old Khloe in a bathtub full of sweets, was filmed for Lamar and was shown on Keeping Up With The Kardashians back in 2010.
Khloe was horrified that her video had ended up on an adult website calling it 'sick and gross', but Kris Jenner's reaction was slightly more upbeat and she even pondered whether she should make one herself.
The episode was filmed before the revelations of Lamar's alleged cheating came to light a month ago.
It is thought that Lamar met stripper Jennifer Richardson in a strip club in Washington D.C. in January 2012 and since then have been seeing each other numerous times in Los Angeles. Lamar and Khloe have yet to comment directly about Jennifer's allegations.