40 of Kourtney Kardashian's Sexiest Instagram Snaps

According to Kourtney, this lingerie-clad bod comes courtesy of using clean body products both inside and out.

Kourt celebrated her 40th birthday a week early in Finland, where she enjoyed a hot tub afternoon in a snowy landscape.

The reality star posed topless to celebrate the launch of her new lifestyle website, Poosh.

It's amazing how strategically placed these bubbles were in a bathtub pic Kourt captioned, "Love yourself as deeply as you love them."

Kourtney is no snake, but she is a gal who can rock a diamond choker while topless. 

The mom of three showed off her alluring one-piece while vacationing in Cabo San Lucas, Mexico.

Lacy underthings don't always need to be kept hidden.

Kourt mixed decades with a sultry '80s-era dress and a gigantic, glittery '90s cell phone in a snap she joked was a "wrong number."

Booties up! Kourtney and Kendall got their hot tub on while sipping on hot cocoa in Aspen. "What’s hotter than hot chocolate?" the eldest KarJenner asked. These two, clearly!

The California girl took a cue from sister Kendall Jenner, posing in the snow while rocking a bikini during the family's winter vacation in Aspen, Colorado. She did keep slighlty warm by wearing ski boots and topping the bathing suit with a metallic puffer.

Kourtney managed to upstage Santa Claus, but then again, he wasn't wearing a strapless cut-out gown.

The University of Arizona grad put a modern spin on a sexy Old Hollywood-inspired ensemble.

Kourtney caused a bit of controversy when she first posted this pic of herself lounging on a bed in front of her ex, Scott Disick, and their daughter, Penelope, which she jokingly captioned, "Coparenting."

The hot mama brought fans behind the scenes of her GQ Mexico photoshoot. 

Kourtney's GQ Mexico shoot left little to the imagination. 

Someone loves her Fendi gear!

All of the Kardashian-Jenner sisters got to be Victoria's Secret Angels for a night, and it's clear to see why!

Mesh tops, sequined pants and metallic shoes made for one perfect ensemble for a night out in Bali, Indonesia.

A close-up selfie can be just as sultry as a full-body belfie!

Rocking an oversized men's button-down and nothing else is pretty much the unviersal sign of "I know I look good."

Kourtney showed off her crazy fit bod while tugging on her bikini bottoms and stepping into an infinity pool.

 Nothing's sexier than a megawatt smile! 

We, too, would like to lounge around in a robe as often as possible.

A warm summer night calls for a skintight bright orange mini. 

Honestly, we just want to know who snapped this pic of Kourtney in an outdoor shower.

Kourtney lounged around in a neon bikini, calling her day a "sweet Sunday."

The mom of three was ready to hit the town for her sister, Kylie Jenner's, 21st birthday in a plunging purple mini, huge gold hoops and a smoldering smoky eye.

Is anything sexier than supporting your home team? We think not!

Kourtney claimed it only took her "45 minutes to get all dressed up," and we are supremely jealous after seeing how good she looked for a fun night out -- and also her ability to pose in a car.

Kim knows, too -- dessert has never looked so good!

Kourtney was literally glowing in a pic that was so well lit, she looked like a doll. She clearly knew this, seeing as her Instagram caption read, "I'm real, I promise."

...right where she's sitting! "Don’t be shady, be a lady☀️," Kourtney captioned a snap of herself enjoying the sunshine in a floral thong bikini -- but staying sun safe with a giant floppy hat!

The best accessory to a tan bikini? A pile of bread, of course! "Just finished my daily basket of focaccia...hbu?" the gorgeous mom wrote while vacationing in Portofino, Italy.

Kourtney oozed European vacation vibes during a boat trip in Capri, Italy.

This is probably the best a Vespa has ever looked...

Booty-baring button-downs are clearly Kourtney's thing.

Kourtney loves a good beach day!

This gal should have a master's in sexy bathing suit posing.

Kourtney proudly showed off her bod in a red Christian Dior bra and white Calvin Klein bottoms. She even added extra heat by rocking red hot eyeshadow shades from her KOURT X KYLIE collaboration.

Kylie snapped a selfie of her and Kourtney that proved that looking stunning is clearly in their genes!