Although this attractive blonde came to prominence as a boy-crazed teen on 8 Simple Rules, Cuoco already had a decade of acting under her belt when she joined the sitcom in 2002. A successful child model and performer, she amassed an impressive array of film and TV parts before she was even old enough to vote. When 8 Simple Rules was canceled in 2005, Cuoco was quickly snatched up as new blood for Charmed. But the occult series was struggling in its eighth season and was canceled the following year.