"Happy birthday to my big brother! You were my first friend and you are still my best friend today," Scott wrote in the caption.
The super cute photo mosaic featured shots of the adorable brothers playing football on the beach as toddlers, wearing Goofy hats, wearing their best childhood suits and passed out in their bed as youngsters, among other pics.
"Thank you for being the greatest- I love you so damn much!!" Scott added.