Overalls were all the rage back when this now famous boy bander was just a schoolboy. Can you identify who the blondie is based on this super cute yearbook photo?

While he's widely known as a member of a four-person boy band, which actually formed through a musical television sitcom, this guy has also exercised his musical abilities elsewhere in side projects. Aside from singing and guitar skills, this guy has also racked up lots of acting accomplishments, with appearances on TV shows like 'ER' and 'Frasier.'

Do you think you've figured out who this little kid grew up to be? Click through below to find out whose yearbook photo this is!