The ultimate test of a BFF-level friendship? Matching hairstyles, of course.

While it's no secret that cousins North West and Penelope Disick have created their very own mini squad, Kim Kardashian West shared a new and very adorable development in the pair's close friendship—twinning pigtail buns!

Credit: Kim Kardashian / Instagram

The Keeping Up With the Kardashians star took to Instagram to post a too-cute look at the inseparable duo's mid-week hang out. One photo depicts a sweet group hug with another squad member, Ryan, who is the daughter of Kim's friend Tracy Romulus, while another shot shows North sneaking a mischievous side glance at her grinning cousin.

Credit: Tracy Nguyen Romulus / Instagram

Though we've spotted little Nori sporting the sweet buns as recently as last month, we're loving that Penelope jumped on the pigtail bandwagon to twin with her BFF!