"'Congratulations, Mr. and Mrs. Jenner! You've just joined the mile-high club. We're so proud of you, we decided to give you a bottle of champagne! Yay!' I could not squish down in my seat low enough. I was mortified!" Jenner told Cosmopolitan magazine.

By Karen Mizoguchi
Updated October 08, 2015 11:00 PM
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Kris Jenner is revealing her most embarrassing moment, a detail that fans may have heard (and seen) her share before.

“The most embarrassing moment for me was when I was with [Caitlyn Jenner, formerly Bruce Jenner] on a commercial airliner in first class. We joined the Mile High club,” Jenner, 59, told Cosmopolitan in a behind-the-scenes video from the 50th anniversary cover shoot.

“We felt we got away with it. We had sex in the bathroom and we came out and nobody said anything,” Jenner added before spilling the most humiliating details of the story.

“At the end of the flight, the flight attendant got on the microphone. ‘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!”

The momager has previously disclosed how she got her mile-high club membership during her short-lived daytime talk show Kris.

“We were so sneaky, 007,” she explained of her American Airlines flight, before either daughters Kendall or Kylie were born.