Look at this saintly little lad! Can you guess which Catholic schoolboy turned boy band superstar is posing in this yearbook photo?

This actually might be the most innocent you'll ever see this British singer look, as he's known for being a bit of a party boy and is never afraid to voice what's on his mind... even if it's something negative. We're glad he became famous along with his four bandmates, because otherwise we'd never get to hear that beautiful voice of his!

Have you figured out who this is yet? Click through to find out for sure!