With his mop of unruly curly hair and sweet smile, Johnny Galecki won hearts and honed his comic abilities over a five season (1992-1997) stint on the hit ABC sitcom "Roseanne". Cast as David, the mixed-up but gentle-hearted boyfriend of Sara Gilbert's Darlene, the young actor injected a fresh perspective into the show's volatile proceedings and developed into a fan favorite.

Born in Belgium (where his father was stationed while serving in the US Air Force) and raised in Chicago, Galecki knew at an early age that he wanted to be an actor. By age seven, he had begun to land roles in local