After Kim and Khloe Kardashian spilled the beans on their mother’s sex life, Kris Jenner seems to be a lot more open about it now.

In their Cosmopolitan 50^th anniversary cover shoot behind the scenes video, Kris shared her most embarrassing experience, which involved her former husband Caitlyn Jenner, formerly Bruce Jenner.

Kris Jenner’s most embarrassing moment with Caitlyn Jenner? Joining the mile-high club. http://t.co/dXnh2R7gJS pic.twitter.com/b6CbV7OJ8k

— EntertainmentTonight (@etnow) October 9, 2015

“The most embarrassing moment for me was when I was with Caitlyn (formerly Bruce) on a commercial airline in first class. We joined the mile-high club and we felt we got away with it,” Kris said.

“We had sex in the bathroom and we came out and nobody said anything.” To her surprise, a flight attendant congratulated them after the flight and even gave them a reward for officially being members of the fictitious club.

“At the end of the flight, the flight attendant got on the microphone and said, ‘Congratulations, Mr. and Mrs. Jenner! You’ve just joined the mile-high club. We’re so proud of you, and we decided to give you a bottle of champagne! Yay!’

I could not squish down in my seat low enough. I was mortified,” Kris shared. But despite their sneaky James Bond move on air, Kris and Caitlyn ended their 24 years of marriage in 2013. And although things got messy between them when Caitlyn revealed that she’s a transgender and that Kris controlled her [him] in their marriage, they both set aside the feud and were already seen dining with their kids.

Kris Jenner is now with Corey Gamble, and their sex life is no secret either, thanks to Kim and Khloe.

TMI! Kim & Khloe Kardashian discuss Kris Jenner and 33-year-old boyfriend’s ‘creepy’ sex life http://t.co/bVM9WpdXnc pic.twitter.com/06OezsPIas — Mirror Celeb (@MirrorCeleb) March 21, 2015

The Cosmopolitan 50^th anniversary will hit stands this October 13 with Kris Jenner and her daughters, Kim Kardashian, Khloe Kardashian, Kourtney Kardashian, Kendall, and Kylie Jenner on the cover.

Happy 50th birthday @cosmopolitan!!! So honored to be on the November cover with my girls!! #cosmopolitan

A photo posted by @krisjenner on Oct 4, 2015 at 8:10pm PDT

“Happy 50th birthday @cosmopolitan!!!” Kris posted on Instagram. “So honored to be on the November cover with my girls!!”