The family, including Kim Kardashian, Khloe Kardashian, and Kylie Jenner were all on board a private jet, heading home to LA when Kris cranked it up a notch.
The mother-of-six sang expletive-filled songs with the rest of her family, before dancing and performing some impressive high leg kicks in the aisle.
As she, Khloe, 35, and Kylie, 22, sang, "You've got to s*** on a d***, you've got to f*** a duck," Kim roared with laughter.
And her drunk dancing continued, despite daughter Kim, 39, warning her mum in the video that she was posting the footage on her "regular" account.
Wearing a floral mini dress, black tights and flat lace-up boots, Kris danced in the aisles, much to her children's bemusement - but she certainly seemed to be enjoying herself!
Kendall was not filmed on board the jet, but Kylie and Khloe were both seen wearing dressing gowns for their flight, with fluffy Louis Vuitton slippers, while Kim kept cosy in a grey hoodie and a blanket.
Earlier in the day, proud mum Kris had posted a tribute to her daughter Kendall on her Instagram.
"Happy birthday to my beautiful angel girl @kendalljenner!!! You light up every room you walk into and everyone you meet and you light up my life every single day. You are so beautiful inside and out and I’m so proud of you Kenny!! You are the most amazing daughter, sister, friend, and I love you more than you can ever imagine. Have the best day, birthday girl!! You are my heart, ❤️ Mommy #HappyBirthdayKendall 🎂" she wrote, alongside some of her favourite snaps.
