North West loves mermaids and Disney princesses, and she got to celebrate with both at her third birthday party.
While North turned three on June 15, her cousin Penelope Disick, who turns four on July 8, helped her celebrate and got a cake of her own.
On hand were moms Kim and Kourtney Kardashian plus dads Kanye West and Scott Disick along with Khloe Kardashian and Kylie Jenner.
Check out pics from North and Penelope's mermaid party below!
Khloe Kardashian, North and Penelope as mermaids and Mason Disick
Khloe posed with her birthday nieces along with her nephew, Kourtney Kardashian's son Mason Disick.
North West and her cake
North went with a glittery purple tail and turqoise shell bra for her mermaid look.
Penelope got her own cake, too
Penelope opted for the more traditional green tail paired with a starfish bra.
Kim rocked the mermaid glam, too
Kim Kardashian wore a sparkly green tail with a white bustier top and pearls.
Kourtney kept it more casual
The mom of three promoted nonprofit Heal the Bay in this pic on Instagram.
A couple Disney princesses came to help celebrate
North and Penelope attract the A-list.
Khloe rocked lavendar hair for the occasion
"When your nieces request you wear lavender hair to their mermaid party. You wear lavender hair. Anything for my babies!" she wrote on Instagram.
Penelope tried out her tail in the water
Kourtney shared the pic above to Instagram, writing, "My little mermaid."
Kylie was there to celebrate as well
Here she is with Khloe, who noted that it's normally Kylie in the wigs.
Ideas for your own mermaid party: balloons as bubbles and inflatable fish!
There's even Kimoji of the mermaid party
"We're having a mermaid party today and you can too, join us in Kim Kardashian Hollywood!" Kim wrote on Instagram.