David couldn't help himself from gushing over his son's sweet smile in his caption of a black-and-white pic of Cruz in a pool.
"Happy 11th birthday to our little man... 11 years of seeing him grow from a cheeky baby to a cheeky 11 year old," the former soccer pro, 40, wrote. "He makes us laugh every single day and has the most amazing character plus the biggest heart... Love you big boy."
Victoria's caption was just as heartwarming, and the photo she shared of Cruz mid-air on a skateboard could not be any cuter.
"Birthday boy Cruz <3 We love u big boy!!" the 41-year-old fashion designer wrote, signing the message from "Mummy, Daddy" and Cruz's siblings -- Brooklyn, 16, Romeo, 13, and Harper, 4. "Can't believe u r 11 today!! We r all so proud of u!"