Justin Bieber(CP)

Unfortunately for the Biebers of the world, No. 1 Heartthrob status is fleeting. For some teen idols, like "Mercy" star James Van Der Beek, coming of age provides an opportunity for career maturation, while for others, it's a big ole shooing back into obscurity (lookin' at you, JTT). Click through to find out what happened to the biggest teen idols of the '70s, '80s and '90s once they left your bedroom wall.