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North West and Penelope Disick Show Off Their Secret Language in Adorable Video

07/09/2016 at 10:25 AM ET

Kids say the darnedest things!

Cousins Penelope Disick and North West showed off their unique way of communicating on Friday, in a sweet Instagram video posted by North’s mom and Penelope’s aunt, Kim Kardashian West.

“Whatever secret language u girls speak, the way you girls protect each other & love each other is so special,” Kardashian West wrote with the video, which shows the two young girls standing on chairs and holding hands. “Penelope, North is so lucky to have a best friend like you!”

Penelope Disick and North West Kim Kardashian/Instagram

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Kardashian West finished her message with a birthday wish for her young niece, who turned 4 on Friday. “Happy Birthday my sweet P. I love you to the moon and back!” she wrote.

The video was just one of many birthday messages for Kourtney Kardashian and Scott Disick‘s daughter, who celebrated her big day with her mom while on a sun-soaked tropical vacation in the Bahamas

“Happy birthday to my little mermaid! Seeing the magic in the world through your eyes makes me so happy,” Kardashian wrote on Instagram.

Happy birthday to my little mermaid! Seeing the magic in the world through your eyes makes me so happy.

A photo posted by Kourtney Kardashian (@kourtneykardash) on

As for the birthday girl herself? She started her morning with a slice of birthday cake for breakfast, and spent some quality time on a boat with mom.

Penelope Disick cake
Kourtney Kardashian/Snapchat

On mommy's lap.

A photo posted by Kourtney Kardashian (@kourtneykardash) on

Of course, just because North, who turned 3 on June 15, wasn’t with her cousin on her big day doesn’t mean the two didn’t celebrate together. The two had a joint birthday party back in June, donning matching mermaid costumes complete with shells on their tops and full tails inspired by The Little Mermaid. 

And after the event, the BFFs donated a truck load of My Little Pony’s to the Los Angeles Children’s Hospital, a source close to the Kardashians told PEOPLE.

— Dave Quinn

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Ragine on

Poor, sweet little girls. How awful that they were born into such an awful family.
All of Kris’ kids should have been sterilized.
Kris herself should have been sterilized. The world would be a better place if that had happened.

bugsforever on

I think it’s great when cousins are that close.

Jen on

They’re both very cute, and I agree with Bugsforever, it’s so sweet when cousins are that close.