The former soccer player posted a never-before-seen snap of him cradling his newborn son back in 1999, and wrote a touching caption dedicated to his firstborn child on Saturday (04Mar17).

"So on this day 18 years ago this little man came into our lives.... To say we felt blessed is an understatement...," he began, before embarrassing Brooklyn by revealing he used to like Irish boyband Boyzone when he was a baby.

"From day one he never slept through the night the only way he would fall asleep is when I took him out in the car and it had to be Boyzone on the radio and he would drop right off... Thankfully he now sleeps the whole night without needing a song... Brooklyn has gone from this beautiful baby boy to become this handsome, polite and driven young man..." David continued.

Calling Brooklyn by his family nickname of Buster, the 41-year-old concluded his post, "I'm proud that he lived through my career with me and I'm even prouder about the person that he has become... Happy birthday Buster you can now officially take dad for a drink down the pub."

Victoria also took to social media to celebrate her eldest son turning 18, and shared unseen personal photos on Instagram as she paid tribute to the birthday boy. "I can't believe our baby is 18 today. We are all so proud and love u (sic) so much @brooklynbeckham x Happy Birthday Buster x Lots and lots of love x" Victoria captioned a sweet snap of a younger Brooklyn. "The most beautiful, caring, talented young man. We are so proud and love you so much."

Brooklyn later posted a snap as he enjoyed his first legal pint of beer on Saturday night, simply captioning the black-and-white shot, "Pub time". The legal age for alcohol consumption in the U.K. is 18.