Double trouble! Kim and Kourtney Kardashian throw a Merry Monster Mash themed birthday party for sons Saint and Reign

Kim and Kourtney Kardashian's youngest sons both have birthdays in December.

So it was only appropriate for little Saint West, turning two, and Reign Disick, almost three, to celebrate their birthdays with a joint Merry Monster Mash themed celebration this weekend.

The blow-out Calabasas, California party took on a winter theme, complete with real snow, an ice skating rink, two Monsters, Inc. birthday cakes and an appearance from Santa.

Twice as nice! Kim and Kourtney Kardashian's had a double birthday party for sons Saint West and Reign Disick's 2nd and 3rd birthdays which was a winter themed Monster Mash bash
Twice as nice! Kim and Kourtney Kardashian's had a double birthday party for sons Saint West and Reign Disick's 2nd and 3rd birthdays which was a winter themed Monster Mash bash

Twice as nice! Kim and Kourtney Kardashian's had a double birthday party for sons Saint West and Reign Disick's 2nd and 3rd birthdays which was a winter themed Monster Mash bash

Scary sweet! Each toddler got their own Monsters Inc themed cake, with Saint's with the character Mike Wazowski whilst Reign had giant fluffy monster James P Sullivan

Scary sweet! Each toddler got their own Monsters Inc themed cake, with Saint's with the character Mike Wazowski whilst Reign had giant fluffy monster James P Sullivan

Saint second birthday is Tuesday while cousin Reign, whose dad is Kourtney's ex Scott Disick, celebrates his third a week from Thursday.

Saint - who has four-year-old sister North - had the Disney movie's character Mike Wazowski iced on his cake, whilst Reign had giant fluffy monster James P. Sullivan.

Keeping Up With the Kardashians star Kim took to Snapchat over the weekend to share snapshots of the cousins' festive day, which included going ice skating and meeting Santa.

Kayne was even seen taking his little ones onto the rink while puffy silver balloon reading Merry Monster Mash decorated the background.?

Skate date! Kayne was even seen taking his little ones Saint and North, four, onto the rink

Skate date! Kayne was even seen taking his little ones Saint and North, four, onto the rink

Holly jolly! Keeping Up With the Kardashians stars took to Snapchat over the weekend to share snapshots of the cousins' festive day, which included going ice skating and meeting Santa

Holly jolly! Keeping Up With the Kardashians stars took to Snapchat over the weekend to share snapshots of the cousins' festive day, which included going ice skating and meeting Santa

Winter wonderland! The party included an ice skating rink and a hill of real snow to go tubing down

Winter wonderland! The party included an ice skating rink and a hill of real snow to go tubing down

Ice, ice, baby! Saint birthday is Tuesday while cousin Reign, whose dad is Kourtney's ex Scott Disick, celebrates his a week from Thursday

Ice, ice, baby! Saint birthday is Tuesday while cousin Reign, whose dad is Kourtney's ex Scott Disick, celebrates his a week from Thursday

It comes after the 37-year-old beauty threw a cherry blossom-themed baby shower last month, for the upcoming arrival of her third child via surrogate.?

The family enjoyed a Tea for Three party staged in a 'cherry blossom forest' at their Los Angeles home.

Guests at the bash included Kim's half siblings Kylie and Kendall Jenner, sister Khloe Kardashian, and pals Chrissy Tiegen, hairstylist Jen Atkin, and eyebrow artist Anastasia Soare.

North was also in attendance, teaming a Chinese-style dress with a pair of fuzzy slippers.

Oh baby! Kim threw a cherry blossom-themed baby shower last month, for the arrival of her third child via surrogate where daughter North looked darling in a Mandarin style dress

Oh baby! Kim threw a cherry blossom-themed baby shower last month, for the arrival of her third child via surrogate where daughter North looked darling in a Mandarin style dress

Kim shared a Snapchat clip of the youngster and wrote: 'Look at the cute little dress Northie is wearing.'

Kim and her guests all shared videos of the bash on their social media accounts, with Kylie - who is reportedly expecting her first child with Travis Scott - heard to exclaim the decor was 'so gorgeous' as she made her entrance.

Kim gave her guests party favors from her latest KKW Beauty label range, the upcoming new fragrances Crystal Gardenia, Crystal Gardenia Citrus and Crystal Gardenia Oud.

Perfume in the air! At her baby shower Kim gave her guests party favours from her latest KKW Beauty label range, the upcoming new fragrances Crystal Gardenia, Crystal Gardenia Citrus and Crystal Gardenia Oud

Perfume in the air! At her baby shower Kim gave her guests party favours from her latest KKW Beauty label range, the upcoming new fragrances Crystal Gardenia, Crystal Gardenia Citrus and Crystal Gardenia Oud

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