Saint West Is 4 Years Old, and Kim Kardashian Can't Stop Gushing About How Sweet He Is

It may seem like just yesterday that we were cooing over baby pictures of Saint West, but Kim Kardashian's oldest son just celebrated his fourth birthday on Dec. 5, and proud mama Kim took to Instagram to wish him a very happy birthday. "I have no words to describe how much I love your smile and those curls of yours Saint!" Kim gushed. "You bring so much joy into my soul. You are so kind, loving and just so thoughtful and sweet! I am so happy today if your 4th birthday and [sic] We get to celebrate how much you've grown! Happy birthday my sweet sweet Sainty." Yep, my heart just melted a little.

In addition to the adorable message for her 4-year-old son, Kim added that her "sweet sweet Sainty" also has a supercute nickname for her. "(When I say to him my sweet sweet Sainty, he says back to me my sweet sweet sweet sweet Momma, the best momma in the world and the only momma I ever want! HOW CAN YOU NOT MELT AT HIS SWEETNESS)," Kim wrote, and she doesn't seem to be the only one to think that he's absolutely wonderful. "He's honestly one of the sweetest humans I know on this earth!!!!! I'm melting by your caption and his face," Khloé commented on the photo. Happy birthday, Saint!