North West, Penelope Disick don leopard bathing suits for best friend's birthday

The Kardashian cousins are having the best time of their lives!

Kim Kardashian's daughter North West, 7, and Kourtney Kardashian daughter's Penelope Disick, 8, were spotted in  Palm Springs, California, over the weekend to celebrate their friend Ryan Romulus's ninth birthday.

Ryan is the daughter of Tracy Romulus, who is the Chief Marketing Officer of KKW Brands.

Taking to her Instagram on Monday, Tracy shared photos from the all-girls weekend trip where the six friends posed in matching leopard bathing suits. 

"Turned 9 with a Girls Trip," captioned Tracy alongside the photo.

Many friends from the fraternity were quick to comment on the adorable picture

"That is Olympic level parenting," wrote a friend.

"All pretty. North looks like Kim here," added another while comparing North West to mommy Kim Kardashian.