"Happy Birthday Scott!! Thank you for being a loving and devoted father to my beautiful grandkids," Kris gushed alongside a collage of the two together. "I am so blessed to be able to call you my son. I love you and hope you have the most amazing day!"
The reality star also got a shout-out from his "brother for life," Rob Kardashian, who captioned a #TBT, "He is such an amazing Father to 3 Beautiful children and I Love this man very much!! You are very Blessed and this year WILL be a great one for you once again! LOVE YOU, Bob‼"
Scott has yet to receive birthday love from his estranged partner, Kourtney Kardashian, or any of her sisters -- at least, on social media. Even Kendall and Kylie Jenner -- both of whom have been out partying with Scott in recent weeks -- have remained mum thus far.
Can't a "brother" at least get a birthday @reply on Twitter?
As for Kourtney, who split from Scott last summer but has remained close with him, she has been busy Snapchatting gym visits and lunch with her girls, but hasn't posted anything for the father of three kids yet -- despite him wishing her a happy birthday in April via steamy make-out photo.
The two did appear to take a tractor ride together on Wednesday: