Since their split, and his subsequent stay in rehab last year
, Disick has remained close with his ex's family, many of whom shared Instagram pics celebrating his special day as well
. Rob Kardashian called Scott his "brother for life" -- and Kardashian family matriarch Kris Jenner gushed, "I am so blessed to be able to call you my son. I love you and hope you have the most amazing day!"