This past weekend, North West and her cousin Penelope celebrated their birthdays at a joint mermaid-themed party and according to mom Kim Kardashian, the party was ‘perfect’.

“North and P’s birthday was so cute! We had the best stuff for the kids. The ambiance was perfect. Thank you, Mindy Weiss, for putting this cute party together!” Kim writes on her official website.

She continues, “Heal the Bay sent over an aquarium with a crab (North swears it was Sebastian!), starfish and so many other amazing sea creatures. We had a huge bubble show by BubbleMania, story time, incredible balloon sculptures by Balloon Celebrations, and real Aqualillies mermaids swimming with the kids!”

“Hansen’s Cakes provided yummy cakes for the girls, and I even had some! I totally cheated, LOL. We also had ice cream sandwiches by Coolhaus, more snacks by Earlez Grille and adorable cake pops by Jasmine. And Lynn from Diva Body Art Glitter Tattoos gave all the kids temporary glitter tattoos!”

While North turned three on June 15, her cousin Penelope Disick, will turn four on July 8.

Check below for more pictures from the party! For more, head to kimkardashianwest.com.

Photos:KKW