Khloe wrote: "He's honestly one of the sweetest humans I know on this earth!!!!! I’m melting by your caption and his face".
Kim Kardashian's son Saint just turned 4 today.
And the proud mother posted a heartwarming tribute to her little one on Instagram alongside an even more adorable photo.
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"I have no words to describe how much I love your smile and those curls of yours Saint!" She began in her post. "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! 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".
Grandma Kris Jenner commented: "MELT 😍😍😍"
While Khloe wrote: "He's honestly one of the sweetest humans I know on this earth!!!!! I'm melting by your caption and his face 😍😍"
Kim shares the youngster with Kanye West — they have four children together.