Kim Kardashian Is Having All the Feels on Son Saint West's 4th Birthday -- Read Her Sweet Message

Kim Kardashian in november 2019
Rodin Eckenroth/WireImage

"How can you not melt at his sweetness?"

Kim Kardashian West's little man is growing up fast! The mother of four took to social media to celebrate her eldest son Saint West's fourth birthday. 

"I have no words to describe how much I love your smile and those curls of yours Saint!" Kim captioned a grinning shot of Saint, wearing a cross necklace and colorful printed shirt. "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 We get to celebrate how much you’ve grown!" 

She also revealed her nickname for her son, writing, "Happy birthday my sweet sweet Sainty. (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)."

Saint's auntie, Khloe Kardashian, couldn't help but gush over the little guy, commenting, "He’s honestly one of the sweetest humans I know on this earth!!!!! I’m melting by your caption and his face ??."

Saint's grandmomager, Kris Jenner, also shared a sweet tribute to the little cutie, posting four photos of Saint. In one shot, he's kissing a poster of Kris, in another he's holding up a cutout of his dad Kanye West's head, and in another, he's cuddling with his baby brother, Psalm. 

"Happy Birthday Saint!!!! I can hardly believe you are 4 years old!!!! You are growing up so fast... you are such a sweet, funny, kind and amazing boy and I love seeing your sweet face and beautiful smile," Kris wrote. "You bring such joy to everyone around you!! I love you Sainty!!!!!"

Kim recently opened up to ET's Keltie Knight about how her relationship with Kanye has changed in their five years of marriage. 

"I think after having kids, it just is such a life-changer. Life is so different," she told ET. "This is when life really begins. It's been so much fun to be on this journey with someone that just brings you on this whirlwind of a life I never dreamed I'd have."