Calvin Harris may be a model for Emporio Armani underwear, but the 31-year-old wasn't always so, well, ripped!

The DJ shared a throwback photo from 2002, joking that he looked "f–king fantastic" in the dated pic. Even he knows he's aged EXTREMELY well!

RELATED: Taylor Swift and Calvin Harris are House-Hunting Together!

But Taylor Swift's boyfriend isn't the only celeb who's improved since becoming famous. Scroll down to see more remarkable transformations!