The Kardashians Raised Them Right! North West and Penelope Disick Donate a 'Truck Load' of My Little Ponys to a Children's Hospital, Source Says

After their joint birthday party, Penelope Disick and North West decided to share their toys with other children

Photo: Source: Kylie Jenner/Snapchat

Kourtney and Kim Kardashian West are already teaching their young ones the meaning of giving.

North West, who turned 3 on June 15, and Penelope Disick, who turns 4 on July 8, wore matching costumes inspired by The Little Mermaid as they partied with the rest of the Kardashian-Jenner clan this past Saturday. Complete with shells on their tops and full tails, the adorable pair did something amazing after the event.

“North and Penelope donated a truck load of My Little Pony’s to the Los Angeles Children’s Hospital,” a source close to the Kardashians tells PEOPLE. “North and Penelope celebrated their birthdays at a joint mermaid-themed party this past weekend where all of the party goers had gift bags filled with Nori and Penelope’s favorite toy, My Little Pony.”

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

These two are the perfect peas in a pod.

North’s love for My Little Pony goes way back. In October of 2015, Kim appeared on the Ellen DeGeneres Show and brought along her daughter as well as a few ponies. While backstage, DeGeneres spent some one-on-one time with Nori, learning the proper way to brush the pony’s colorful hair.

The reality star snapped a photo and shared it online of the comedian and North with the caption: “Who saw @TheEllenShow today? Well this is right before I went on Northie & Ellen brushing My Little Pony s hair lol.”

Keeping Up with the Kardashians airs Sundays (9 p.m. ET) on E!