Emily Exton | December 14, 2014 9:55 pm

Kourtney Kardashian 2014

The Kardashian-Jenner family just got larger. Kourtney Kardashian welcomed her third child with longtime partner Scott Disick on Sunday, People reports.

The couple’s baby boy arrived on the same day as older brother Mason’s fifth birthday. Since Kourtney and Scott were obviously a little busy, Aunt Kim was on birthday have fun duty. But the largest question? Will the new baby call Kris Jenner “grandma”?

Pleased Birthday to the lego master Mason!!! You are so big I can’t take it! You are my everything!!!!! I like you so much!!!!

A photo posted by Kim Kardashian West (@kimkardashian) on Dec 12, 2014 at 10:34am PST

See Scott and Kourtney through the years, below.

View Photo Gallery

The Gossip Desk has more on Kourtney and Scott’s relationship.

[Photo Credit: Splash News]

Tags: Scott Disick, Kourtney Kardashian

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