Kendall Jenner Lets It All Hang Out In Bathroom Underwear Video

Gettyimages | Hollywood To You/Star Max

Kendall Jenner is back in her undies – more specifically, ones designed by big sister Kim Kardashian. The 23-year-old supermodel opted out of delivering any thirst traps over Valentine's Day, but she more than made up for it on Saturday.

Kendall took to her stories both to show off her jaw-dropping body and help out 39-year-old sister Kim – the SKIMS founder receives plenty of help from her famous sisters when it comes to promoting her 2019-founded shapewear and clothing line.

Kendall Jenner/Instagram

Kendall's video was a selfie. The "Keeping Up With The Kardashians" star had filmed herself in her bathroom and backed by the vein marbles forming its walls and a tub.

This was no high-brow photoshoot. Kendall had opted for a low-frills finish as she zoomed in and out, showing off her super-slim and curvy frame in a black pair of SKIMS underwear. The star wore a high-waisted pair of panties, pairing them with a simple and soft-cupped bra with a v-shaped neckline and sizeable straps. A little cleavage was flashed, alongside the model's super-flat stomach, trim hips, and slender shoulders.

Kendall Jenner/Instagram

Kendall's Instagram activity is definitely high on the promotional front. The model features in more ads than her sisters – way more than 22-year-old sister Kylie – with 2019 actually seeing Kendall rank top as highest-paid female influencer on Instagram.

Kendall's 2019 earnings were a staggering $15.9 million – from Instagram alone. Ads from the star included her high-profile Adidas partnership, ambassador status for Tiffany & Co., plus promos for footwear brand Stuart Weitzman, skincare company Proactiv, luggage brand Longchamps, and clothing giant Calvin Klein (among others).

Kendall Jenner/Instagram

Kendall was born into fame. The star grew up on her family's hit E! show, but Kendall maintains that being a KarJenner was, in fact, of little help in terms of landing a modeling career.

“I’ve always been a hard worker: that’s in my blood. My parents raised me and my little sister to be that way and the rest of my sisters, too. A lot of people assumed that because I came from a ‘name’ that it was a lot easier for me to get to where I got, but actually it’s the completely opposite," she told Vogue in 2019.

Kim Kardashian/Instagram

Kim's SKIMS line has received plenty of press since its launch last year. It isn't all buzz, though, with sales of the KKW Beauty founder's merch through the roof. In fact, reports suggest that Kim may be eyeing up a billionaire status thanks to the brand.

Celebrity promo has definitely helped, though. Alongside her famous sisters, Kim has received help from the likes of Chelsea Handler via a hilarious "naked beach run" video, plus faces including Lisa Rinna. Kim remains the brand's face, though.

Clearly, Kendall was in the mood to help Kim out today.