Kris Jenner is convinced Khloe Kardashian has been sleeping with Tristan Thompson

In a teaser clip for the remainder of season 18 of 'Keeping Up With the Kardashians' - which will return in September due to production delays because of the pandemic - Khloe, her mother Kris, sister Kim Kardashian West and Scott Disick took part in a conference video call.

Scott - who has three children with his ex-girlfriend, Khloe's sister Kourtney Kardashian - asked the group: "Has Khloe slept with Tristan again?"

Without hesitating, her mother confidently replied: "Oh, 100%."

However, Khloe insisted she hadn't while she carried on doing her make-up on the call.

The 35-year-old beauty recently decided to ask Tristan to be a sperm donor so she could get some embryos frozen to boost her chances of having a baby later down the line.

She said: "I've been doing hormone injections for about five days and the injection process has been fine. I don't know why, I'm like, 'Oh, OK, it's not that bad.'

"I do have a sperm donor. Yeah, Tristan."

However, the TV star admitted the scenario was "weird" as she and Tristan are no longer together.

Speaking to her sisters, she explained: "He has to sign, like, legal paperwork that he would just be my sperm donor.

"But you never know. What if, in three years, I get married to someone and I'm like, 'You know what, I don't want that.'"

The 29-year-old sportsman - who split from Khloe after he kissed model Jordyn Woods - pledged to support his ex-girlfriend through the process.

He told her: "I'm open to doing that and down for doing that.

"At the end of the day, I want whatever is gonna make you feel comfortable and also makes you feel safest and everything, that's what I'm on board with ... so however I can help.

"When I come out in the summertime I can do it and we can go from there."