Forget Dothraki, we want to learn Penelope Disick and North West’s secret language! The precious cousins are clearly life-long besties, as demonstrated in Kim Kardashian’s sweet new Instagram video.
Little P just turned 4 and to honor the occasion, the Selfish author took to social media on Friday to share a squeal-inducing clip of her niece and her daughter practicing a language all their own.
MORE: Penelope Disick Turns 4! Read Kourtney Kardashian's Sweet Birthday Message to Her 'Little Mermaid'
“Whatever secret language u girls speak, the way you girls protect each other & love each other is so special. Penelope, North is so lucky to have a best friend like you! Happy Birthday my sweet P. I love you to the moon and back!” Kim captioned the video.
In the Instagram, the pals are seemingly shouting in gibberish while a patient Mason Disick sits nearby.
These little ones have been basically inseparable since day one. They dress up in matching Halloween costumes together, get princess makeovers at Disneyland, and even had a joint birthday party last month.
Kim wasn’t the only one celebrating Penelope’s big day. Proud mom Kourtney Kardashian also took to Instagram to honor her daughter.
WATCH: Kardashians Celebrate North West & Penelope Disick's Birthdays With Mermaid-Themed Joint Party
“Happy birthday to my little mermaid! Seeing the magic in the world through your eyes makes me so happy” she captioned a sweet picture of Penelope in a mermaid’s costume.
Penelope is currently vacationing with her mom and brothers and family friend Larsa Pippen. On July 8, Kourtney shared a shot of herself sitting on a yacht with Penelope, writing, “On mommy’s lap.”