Lizzie McGuire defined a childhood for many viewers. From 2001-2004, the Disney Channel original series depicted the trials and tribulations of middle schooler Lizzie McGuire. She, of course, was Hilary Duff. The show was so successful and influential, there was even a film adaptation. But middle school doesn't last forever, and all the actors moved on and grew up. Want to see the cast of Lizzie McGuire now? You rang.