Can You Guess the Celebrity in This Yearbook Photo?

This pop star has always been a charmer -- even way back when! If you need proof, just take a look at his yearbook photo.

These days, this cutie's bright blue eyes and adorable smile definitely make teenage girls weak in the knees. You'll also find that the boy bander is sporting lots of tattoos, including a ship, butterfly and rose.

Think you know who it is? Click through to find out!