If you know anything about J-14, you know that we love our hot guys. When Cody Simpson first broke onto the scene, he stole our hearts with his adorable smile and pop-tastic songs like "On My Mind." The singer turns 19 years old today, and he looks drastically different than he did just two years ago.

We're not saying that these guys are no longer hot. It's more like, they look nothing like the squeaky-clean heartthrobs we first fell in love with.

Click through to see photos of former teen hotties, and let us know which transformation shocked you the most!