. >> extra with jim parsons and johnny galecki along with the girl next door kaley cuoco. where are they before they exploded into superstardom, the beauty amongst the brains, pe y penny. >> who can say their first big movie was with russell crow and denzel washington? that movie, kaley was just nine years old. one year later she was picked to play a young ellen degeneres on ellen. her life was changed when she starred as the late john ritter's daughter on eight simple rules. >> we're going to take this moment to talk to johnny galecki. hello. >> hello. >> for nearly 30 years. >> his big break came in 1989 when he was cast was the third rusty in national lampoon's christmas vacation. >> geez, look at the time. i've got to get to bed. >> but it was his five seasons on roseanne that cemented his status. he also was on an episode of blossom. everybody still knows her as blossom. but even before that she stole the show in the tear jerker beaches playing a younger version of bette midler. mayim forged a new career as a neuro scientist. >> it's like coming into high school in th