Guess Who This Mascot Kid Turned Into!

Before this cute little kid was getting the crowds fired up as an international musician and bass-playing heartthrob, he was just another tot in a turtleneck posing with a furry feline mascot while growing up in a suburb of Chicago, Illinois.

This young man traded in his vertical striped shirts for a much more emo sense of style ... complete with spiked hair and guy-liner ... when he gained fame for his part in a pop/punk boy band.

He's since upgraded from his cat costume partner to marry (and divorce) another Hollywood rocker that he shares three kids with.