Hilary Duff is ready to make her next big career move: Network sitcom star. After having a hit Disney Channel show, Lizzy McGuire, and two albums, Duff, 21, has now signed on to star in the new Fox sitcom Barely Legal. The actress will play Kathleen Holtz, who, at 18 years-old, became the youngest person ever to pass the California bar exam. Hilary knows a bit about over-achieving! (Photo: WENN)