North West and Penelope Disick Are Little Mermaids in Their Joint Birthday Bash

06/19/2016 at 10:47 AM ET

The Kardashians don’t skimp on birthday parties, especially when it’s a joint celebration for cousins and best friends North West and Penelope Disick!

North, who turned 3 on June 15, and Penelope, who turns 4 on July 8, went under the sea for a mermaid-themed party with most of the Kardashian-Jenners in attendance.

The cute cousins wore mermaid costumes, complete with shells on their tops and full tails, while their aunts also got in on the action. Kim Kardashian West, 35, broke out her famous 2012 Halloween costume to match with the birthday girls while Khloé Kardashian, 31, proved you’re never to old for dress up as she donned a lavender wig (which only cost $39.99, according to her hairstylist).

Khloe Kardashian with Mason Disick, North West and Penelope Disick
Kylie Jenner/Snapchat

Kim Kardashian
Kylie Jenner/Snapchat

Khloé later admitted on Instagram that her nieces asked her to wear the new ‘do. “When your nieces request you wear lavender hair to their mermaid party. You wear lavender hair. Anything for my babies!” she wrote.

Kylie Jenner, 18, opted for a more casual look but documented the day’s events on Snapchat and Instagram nonetheless.

There was event an appearance from Princess Ariel herself!

North West
Kylie Jenner/Snapchat

Kylie also captured Penelope posing with one of the two elaborate cakes that matched the birthday girls.

Penelope Disick
Kylie Jenner/Snapchat

North, the daughter of Kim and Kanye West, also celebrated her third birthday this week by heading to the Disneyland Resort in California.

“They had a fun day celebrating North’s birthday,” a source told PEOPLE. “The kids have all been to the park several times and have their favorite rides. They had fun on rides like the Mad Tea Party, King Arthur Carousel and the Jungle Cruise.”

–Stephanie Petit

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Showing 17 comments

Emily Lolandes on

Where are those kids smiles???

Lana on

Cute babies!

Em on

My daughter never smiled in pictures for a while at that age. It’s not a true representation of thier life quality 😂

Liz on

Considering how fair skinned Kourtney and Scott Disick are, it really surprises me their daughter is much darker. Hopefully that’s not from her getting a tan from the sun–too much for a little one.

Shay on

The usual over the top extravaganza for appearance’s sake. This family needs to go far far away.

Guest no#3 on

These kids never smile because they are never around their parents long enough to get to know them. The look on those little girls faces is that of FEAR ….I mean can you imagine what goes thru Little North’s mind, hearing all that vulgar language, Kim’s ranting and raving, Kris’s non stop chatter? Kanye’s ” constant Texting… wonder those kids are always looking terrified
Regardless if this is supposed to be “American Royalty” the entire family never seems genuinely happy about anything, unless they are talking about sex, drinking and what /who they screwed the night before.
I have heard Mason Disick on YouTube videos and that child has a nasty mouth. Had I said HALF the things Mason says to the Papazazzi
I would have had my back-side warmed pretty good….AND don’t admonish me about the fact that the Papazazzi is a pain in the A$$….All of the K/J families make SURE that these vultures , better known as the paparazzi knows where they are at all times ! This family has more coverage than any star…ever.
Enjoy the attention while it lasts….hopefully within a couple of years this family will fade off into the sunset and we won’t have to hear about them

Guest no#3 on

Cute? Kourtney’s kids are the ugliest kids I have ever seen . Mason is really ugly. He looks like a homeless kid with his hair that’s looks like it’s never combed. The reason I think Mason is homely is the way Kourt & Scott allow Mason to act while out in public, I would never let my child talk to people ( who by the way are perfect strangers ) as he does

peyton on

Children with bellies are dehydrated…. Look at these little humans. Who is taking care of them….

Charlotte on

Seriously – who really cares?

patty on

That’s sweet that Penelope & North are best buddies. They will always have each other’s backs as they grow older. Looks like never a dull moment in that family.

LA on

Cute kids. You can see how close Penelope and North are. These kids will be friends forever.

Regina Anthony on

How they have a joint birthday bash when one birthday is in June and the other in July,really, #Hoedashians are really special.

Anonymous on

The Kardashians really do put out some UGLY kids. These pics secure the careers of the next generation of Americas top Hollywood plastic surgeons.

jen on

so nice to the sweet comments regarding children’s celebrations. what a bunch of bullies people are ….taking aim at three year olds.

Anonymous on

Awww so cute! !

Sasha on

Cute kids 😍

Pam on

Yup the kids are adorable.