From baby showers to planning their annual epic Christmas bash, the Keeping Up with the Kardashians stars have had their hands full this holiday season — and this weekend was no exception.

On Sunday, Kim Kardashian West and her sister Kourtney Kardashian threw a joint birthday party for their sons: Saint, who turns 2 on Tuesday, and Reign Aston, who turns 3 on Dec. 14.

Both moms took to Snapchat to document the Monsters Inc.-themed celebration, which included a ton of winter-appropriate outdoor activities like ice skating, sledding (on fake snow) and a visit from Santa Claus.

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RELATED VIDEO: North West and Penelope Disick Celebrate Their Birthdays with a Joint Moana-themed Bash


Kim, 37, shared an adorable shot of her husband Kanye West gently leading Saint and the couple’s daughter North, 4, towards the ice-skating rink, above which hung a string of twinkly lights and the words “Merry Monster Mash” spelled out in silver balloons.

Kim and Kourtney, 38, also surprised the two boys with their own individual confections, themed after the two BFFs from the films: a James P. “Sulley” Sullivan cake for Reign, and a Mike Wazowski cake for Saint.

FROM PEN: Learn Alex Guarnaschelli’s Ganache Secrets Before Your Holiday Parties


RELATED: “Welcome to Chrissy’s Pan Am Flight!”: Pregnant Teigen Celebrates Birthday Alongside Kim with Pan Am-Themed Bash

This isn’t the first time the Disick-West cousins have celebrated their birthdays together — and Disney seems to be a common theme!

In June, Kim and Kourtney threw their daughters a joint Moana-powered party to celebrate North’s 4th birthday on June 15, and Penelope Scotland‘s 5th birthday on July 8.

And in 2016, the two girls celebrated with a mermaid-themed bash.

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