Celebrity cousins North West and Penelope Disick were feted at a unicorn-themed joint birthday party.

North, who turns 5 on June 15, and Penelope, who turns 6 on July 8, celebrated with their respective moms Kim Kardashian and Kourtney Kardashian, and other family and friends Sunday.

North and Penelope wore matching rainbow swimsuits and robes to the party. Kim Kardashian posted a video on Instagram Stories of the pair visiting the cotton candy and s'mores stations.

"North and P, twin girls, turn around. Oh hey, girls!" the 37-year-old television personality said in the clip. "Happy birthday, ladies!"

The lavish celebration also featured a dessert table loaded with unicorn-themed treats, live miniature ponies wearing unicorn horns and rainbow floaties in the pool.

Kim and Kourtney's mom, Kris Jenner, grandmother MJ Day, and sister Kylie Jenner were among the other guests. Kylie Jennie brought along her daughter, Stormi, who was born in February.

Kim Kardashian is mom to North, 2-year-old son Saint and 4-month-old daughter Chicago with her husband, Kanye West.

Kourtney Kardashian has Penelope, an 8-year-old son Mason and 3-year-old son Reign with her ex-partner Scott Disick.