Kourtney Kardashian: Nude, YOLO-ing Hard on Keeping Up!

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Grab some ice water, 'cause Kourtney Kardashian partakes in a nude photo shoot on Sunday's episode of Keeping Up with the Kardashians.

That's one way to revive sagging ratings.

One thing that's not sagging, though?

Kourtney Kardashian Nude GIF

Let's just say that the 38-year-old mother of three is getting her money's worth out of that plastic surgery procedure she had ages ago.

If you know what we mean ... anyway.

Stripping down to her birthday suit and posing in a wet, wild and naked photo shoot in Costa Rica, Kourtney still knows how to turn heads.

Among those turning heads?

Young Kylie Jenner's.

Photographer Mike Rosenthal was on hand to capture Kourtney's intense poolside shoot, while her siblings could only stare on in awe.

"What the f--k!" the 19-year-old Kylie says after taking a look at her eldest sibling, who is twice her age and rocking the hottest body.

"I want to get in."

"I'm so jealous!"

Kylie quote

You may have to take a number, Kylie.

"Kourt, you are giving life right now!" hairstylist Jen Atkin adds as the crew watches her work it like a boss in front of the camera lens.

"I honestly was worried about you after Penelope," Khloe admits to her later in an E! confessional. "I did think, like, she's gone."

"Now," Khloe says, "she's YOLO-ing it up."

Her younger sister can't help but gawk at her "f--king bomb ass body, naked in the pool ... your sisters should be afraid of you."

By afraid, we assume she means in the sense that she's stealing their thunder, showing up the queen of the Revenge Body even.

The gauntlet of hotness is officially thrown down.

As Kourtney continues to splash around and whip her hair, water cascading down her chest, Mike snaps one amazing picture after another.

All the while, jaws continue to drop.

Kourtney Kardashian Nude on Keeping Up

Besides Kourtney writhing around like a mermaid goddess and making fans need a cold shower, water is used in different way this week.

In a preview for this week's Keeping Up, Scott Disick is confronted after bringing a woman with him as a "date" ... on this family vacation.

"I did something wrong as always," Disick says, an apology dripping with more sarcasm than there is water dripping down his baby mama's ...

Sorry. We'll stop, we swear.

That body though. OMG. What we wouldn't give to be in that pool right now, or what object she's squatting on to hold herself ...

Ugh. Sorry. We can't help ourselves, so we'll just own that. See the tease below for yourselves and set your DVRs for Sunday right now.

You won't regret it.

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Kourtney Kardashian, Kylie Jenner
Keeping Up with the Kardashians
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Kourtney Kardashian Biography

Kourtney Kardashian With Fake Tattoos
Kourtney Kardashian is the least known of the older Kardashian sisters. She's probably the best looking, though. Kourtney has never made... More »
Los Angeles, California
Full Name
Kourtney Mary Kardashian