01/04/2012 12:01 pm ET

Justin Timberlake, Jessica Biel Engaged: Watch Them On '7th Heaven' & 'Mickey Mouse Club' (VIDEO)

Justin Timberlake and Jessica Biel are now engaged. But before they were one of Hollywood's hottest couples, they both launched their now blockbuster careers in the humble world of TV.

A pre-Timberlake Biel was breaking hearts as Mary Camden on The WB's "7th Heaven." She may have been a preacher's daughter, but Mary was definitely the wild child of the Camden bunch, hooking up with bad boys and trashing high school gyms.

Meanwhile, a baby-faced Timberlake made his TV debut on the ill-fated "Mickey Mouse Club" reboot, where he sang and danced with fellow soon-to-be pop superstars, Britney Spears and Christina Aguilera, and did skits with future award-winning actors, Ryan Gosling and Keri Russell.

Before Timberlake and Biel walk down the aisle, take a walk down memory lane with the couple's most memorable TV moments.