Happy birthday, Saint West!
"Happy Birthday to my favorite boy my Sainty Joon," Kim captioned an Instagram pic of her son lounging in a Chicago White Sox t-shirt. "I must have done something really special to deserve having you as my son. I love you to the galaxy and back."
Kris Jenner shared a series of sweet photos of her grandson, with a super sweet caption. "Happy Birthday to our adorable Saint!" she wrote. "You bring so much love and joy into our lives! You are such a special, yummy part of my heart! We all love you so much!! #HappyBirthdaySaint."
And Saint's aunt, Khloe Kardashian, also got in on the birthday fun, sharing a cute snap of the two cuddling. "I love you Sainty Joon!!!," she captioned the shot. "Happy birthday!! they are growing up so fast."
Saint and cousin Reign Disick -- who turns 4 on Dec. 14 -- celebrated their birthdays on Saturday with a joint, Tarzan-themed bash at Kim's house. The reality star shared tons of pics and video from the adorable fiesta, showing followers how she went all-out decorating for the jungle theme.
See more from the famous family in the video below.