"When you find your sis at the party @kendalljenner," Ky captioned the video below, complete with a dramatic sound effect in the background, for added awesomeness.
Of course, the party they were at was none other than their adorable little nephews' birthday party. Yes, nephewS! Little Reign and his big brother Mason, actually share a birthday, so Kourtney Kardashian had a joint party and went all out, complete with alien laser tag for the adults.
Looks like everyone had a great time, especially the birthday boys! HBD, Reign and Mason!
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Gallery | Kendall and Kylie Jenner: Stylish Sisters