They may have been missing Kim Kardashian and Kendall Jenner, but Kourney Kardashian and Kylie Jenner still threw their sister Khloe one heck of a 31st birthday bash!

Rather than renting out a club, the group went to Pinz Bowling in Studio City on Saturday night, and even though Khloe's boobs were practically hanging out of her top, it was a relatively tame night. In fact, Kourt brought her five-year-old son Mason along for the fun and games!

“A little birthday bowling with my faves. 🎳,” Khloe captioned her Instagram photo. Of course, Kylie posted the shot above and practically cropped her sister out! Talk about pulling a Kim K...

Kylie may be a little self-centered when it comes to her pics, but she definitely went all out with the cake she bought her big sis: