Kourtney Kardashian posts sexy Calvin Klein underwear selfie with boyfriend Younes Bendjima

Kourtney Kardashian straddled boyfriend Younes Bendjima in a sexy new underwear selfie.

The 38-year-old reality star took to Instagram on Friday to share the steamy snap, which saw her wearing a matching set of black Calvin Kleins as she sat on top of her beau.

Kourtney left her jeans open and showed off her flat stomach and cleavage as she wrapped her arm around her 24-year-old boyfriend, who sat on the floor with his shirt off.

Younes revealed his own impressive abs as he rested his hands on his girlfriend’s bottom.

Kourtney captioned the shot: “#mycalvins #ad @calvinklein”.

Earlier this year, the mum-of-three joined her two younger siblings, Kim and Khloe, as well as half-sisters, Kendall and Kylie Jenner, for a campaign with the famous designer.

In the shot, the stunning girls are seen lying on a red and white blanket, while Kylie, 20 — who was pregnant with daughter Stormi at the time — was wrapped up in it, leaving just her bra on show.

Beside her, Khloe, 33, who is also pregnant, could be seen holding her stomach as she posed in the iconic underwear shot.

Kim, who welcomed her third child via surrogate in January, can be seen stretched out, while Kourtney was topless, covering her breasts with the blanket.

Meanwhile Kendall struck a model pose in a white vest top with a pair of the brand’s boxers.

Other images saw the women modelling a range of Western-style clothing while filming in a barn in LA.

A press release alongside the image read: “This campaign captures these bonds and brings to life different ways we can inspire families — both born and made — to connect with one another, and celebrate the things that unite us.”

Opening up about the shoot, Kim told Vogue: “Raf had this American vision in a barn with my family.”

While Kourtney added: “As sisters, we talk to each other all the time. We’re definitely a modern family, and Calvin Klein embodies Americana.”

This article originally appeared in the New York Post and has been republished here with permission.