Image Credit: WireImage Hey now, hey now - in case you forgot, Hilary Duff was one of the most popular singers of the early 2000s. Paving the way for some of the Disney Channel's future stars, she led the sitcom Lizzie McGuire, its titular movie and what would have been its revival series until it was discontinued. But when it came to music, Hilary's fans all knew her timeless bops, such as "Come Clean," "So Yesterday," "Metamorphosis" and plenty more.