Kaley Cuoco is best known for her portrayal of Penny on the CBS sitcom, Big Bang Theory She played Karin Carter in the 1995 action thriller, Virtuosity when she was only ten years old. Nowadays, Kaley is a successful actress with plenty of awards…not to mention a star on the Hollywood Walk of Fame. Today, we thought it would be fun to trip down memory lane and see how much the 34-year-old star has changed since her significant breakthrough role on 8 Simple Rules.