Kris Jenner, 59, Shows Off Bikini Bod, Shoots Down Tummy Tuck Rumors

Haters gonna hate! Kris Jenner shows off her still amazing figure at 59 years old.

At 59 years old, it's safe to say Kris Jenner's still got it!

The Kardashian matriarch showed off her enviable physique while walking on the beach in St. Barts during the family's annual vacation, sporting a little black bikini.

Check out the mother-of-six's impressively flat stomach.

PHOTOS: Hollywood's Best Bikini Bods Over 40

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ET caught up with Kris on Saturday at Williams-Sonoma at The Commons in Calabasas, California -- where she was promoting her cookbook, In The Kitchen with Kris: a Collection of Kardashian-Jenner Family Favorites -- and shared that the sexy picture actually caught her off guard.

"Well, when you think no one's looking, you do some things that you know -- I wouldn't necessarily walk around like that except if I was on my own, or on my own vacation," Kris told ET's Kevin Frazier.

She absolutely denied any speculation that she's had a tummy tuck.

"What I thought was funny was I saw someone posted that picture, and people's comments were like, 'tummy tuck!'" she laughed. "And I'm like, 'tummy tuck?' I had no tummy tuck."

But even though she looks great, Kris did admit to having some bikini insecurities at her age.

"After six kids you're not as confident -- and 59 years old! -- [as] you might be if you were 25 years old with no kids," she explained. "So it's kinda scary to put on a bathing suit and just hang with the kids sometimes in public."

WATCH: EXCLUSIVE -- Kris Jenner Sets the Record Straight on Her Kids' Rumors -- and Why She Fell Asleep on Kanye West!

Speaking of her famous children, Kris also opened up to ET about how her daughter Kim Kardashian's second pregnancy is going, and explained the hilarious photo of herself falling asleep on her son-in-law Kanye West's shoulder during NBA star James Harden's yacht party. Watch below!