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

The 'Revenge Body' host split with the basketball player last year but he is staying with her and their two-year-old daughter True amid the coronavirus pandemic, and her family believe they are more than just amicable co-parents again.

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.''