5, the Keeping Up With the Kardashians star and mom of four posted a sweet slideshow on Instagram of Saint to commemorate his 6th birthday.

The images featured Saint smiling, laughing and posing with his mom from back when he was a toddler all the way to present day.

The KKW Beauty founder also took a moment to commend him on his "negotiating skills," adding that she's "never met anyone" that takes the online game Roblox quite as "serious" as Saint does. !

In the comments underneath Kim's post, Khloe Kardashian also took a moment to give Saint some love, writing, "The absolute cutest!!!!!!!

Filled to the brim with images of Saint with her and the rest of his family, the proud grandmother called him "the sweetest boy who warms my heart" and "lights up every room."