Mason Disick Turns 5, Family Shares Sweet Messages on Instagram

Mason Disick isn't quite old enough to use Instagram yet, but if he was, he would be favoriting up a storm with all of the sweet messages his family shared.

Of course, knowing the Kardashians, they have something special planned for him and he'll be showered with love off of social media as well, so we're sure he's gonna have a good day either way!

he's 5 and I can't take it! stop growing so fast buddy! love you Mase 💙

A photo posted by Kendall Jenner (@kendalljenner) on Dec 12, 2014 at 5:59am PST

Happy Birthday to the lego master Mason!!! You are so big I can't take it! You are my everything!!!!! I love you so much!!!!

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

Stop growing up! How are you 5 already?!?! My ace! My Mase!

A photo posted by Khloé (@khloekardashian) on Dec 12, 2014 at 5:37am PST

Happy Birthday my precious little Mason!!!! You have brought so much love and joy into our lives and I can hardly believe you are 5 today!!! I love you so much....#blessed #family

A photo posted by @krisjenner on Dec 12, 2014 at 7:58am PST

We just can't believe he's five already. It feels like just yesterday that Kourtney found out she and Scott Disick would be welcoming their first child together. Now, that "baby" is already FIVE and their third child is due any second now.

...and now we feel old!

Happy Birthday, Mase!