The fashion designer took to Instagram where she posted a montage of Brooklyn's photographs from the time she was pregnant with him till now.
"I can't believe our baby is 18 today. We are all so proud and love you so much @brooklynbeckham Happy Birthday Buster. Lots and lots of love," she wrote along side the video.
In another photo where one can see the birthday boy showing off his kid muscles, Victoria wrote, "... The most beautiful, caring, talented young man. We are so proud and love you so much".
David took to social media on the next day and wrote a heartwarming birthday post to his son, along side the picture of him cradling a newborn Brooklyn.
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"So on this day 18 years ago this little man came into our lives.... To say we felt blessed is an understatement.
He posted another montage of Brooklyn's photos, captioning it as "18 years of memories!" on his timeline.