See Kaley Cuoco, Johnny Galecki, Jim Parsons, and the rest of the Big Bang Theory cast before they found their inner geeks on CBS
Kaley Cuoco: Then
After appearing as Brady Bunch actress Maureen McCormick in the 2000 TV movie Growing Up Brady (opposite fellow up-and-comer Adam Brody), Cuoco scored a starring role on the ABC sitcom 8 Simple Rules for Dating My Teenage Daughter (later known as 8 Simple Rules). Then just 16 years old, she played Bridget Hennessy, the beautiful but ditzy oldest daughter of Paul Hennessy (the late John Ritter, who died three episodes into the second season). The series was canceled due to low ratings in 2005.
Credit: ABC/CRAIG SJODIN