From the looks of Kim Kardashian's Snapchat and Instagram stories, it's safe to say that Kourtney Kardashian had a popping 39th birthday.

Kimye Shows Major PDA

The mother of three kept things low-key, but she celebrated her birthday with four cakes. Kourtney was joined by her close friends and family members including her mother Kris Jenner, who gave a toast with a cigarette in hand, her little sister Kendall Jenner, brother-in-law Kanye West. Even Kim's former assistant, Stephanie Shepherd, showed up to celebrate the reality star.

Kim made sure to document the epic night and shared it on social media, which also featured a sexy makeout session with her rapper husband West.

One of the many clips shows the KKW Beauty founder flaunting her 24-inch waist and debuting a short blunt bob hairstyle. Wearing a white tube top and a fitted pencil skirt to match, Kim then walks over to Kanye and sits on his lap. She asks him if he rather hit the studio or go to Dave Chapelle and then begins kissing him passionately.

 KimYe ♥️ A post shared by  Kim Kardashian Snapchats  (@kimkardashiansnap) on Apr 19, 2018 at 9:41pm PDT

While the moment should have been too personal, a close friend happened to be sitting close to Kanye and he awkwardly watched the two pack on the PDA.

"You guys are the best married couple I know!" the friend says in the video.

Kanye's appearance on Kim's Snapchat didn't stop there, however. The "Ultralight Beam" rapper also posed with Kris Jenner for a cute photo. 

 best friends A post shared by  Kim Kardashian Snapchats  (@kimkardashiansnap) on Apr 19, 2018 at 10:04pm PDT

 Kylie Jenner  And Khloe Kardashian Are MIA 

Although Kourtney celebrated her last year of being in her 30s with her nearest and dearest loved ones, two of her sisters were noticeably missing out on all the fun from the birthday party. Kylie and Khloe weren't in attendance, however, it makes sense as the two were not in Los Angeles recently. 

Kylie was last spotted in Houston with her boyfriend and baby daddy, Travis Scott. The new parents attended the playoffs game between the Houston Rockets and the Minnesota Timberwolves on Wednesday, April 18.

Khloe, on the other hand, is still reportedly in Cleveland with her first child, True Thompson, who was born on April 12 amid her baby daddy Tristan Thompson's cheating scandal.

There's no word on when the Good American designer will head back to Los Angeles. As reported, her sisters immediately flew to Cleveland when she gave birth earlier this month. 

Khloe might not have been able to join in on the fun but her best friends, twins Malika and Khadijah Haqq were in attendance at the party as they danced the night away with the birthday girl, Kourtney.