Guess Who This Grinning Guy Turned Into!

Before this happy little lad was making the world smile with his rocking music and unmatched good looks, he was just another cool kid growing up on the mean streets of the Upper East Side of Manhattan in New York City.

Even though this well-dressed dude looks good in a pair of overalls ... he turned into a style icon with one-of-a-kind fashion sense and is often spotted on the front row of very important fashion shows.

Try not to let his short hair fool you ... this musician is most recognizable with long beautiful locks.