Kaley Cuoco's bubbly and down-to-earth personality underscored her role as the thinking man's crush on the hit comedy series "The Big Bang Theory" (CBS, 2007- ). Playing a waitress and aspiring actress who befriends her intelligent but socially inept neighbors, Cuoco exuded a perfect blend of innocence and confidence, breaking the mold of the typical blonde bombshell. Prior to her breakout role, Cuoco overcame the impossible when John Ritter, her TV dad on "8 Simple Rules for Dating My Teenage Daughter" (ABC, 2002-05) passed away unexpectedly in 2003. Ready to give up on her acting career, Cuoco decided to honor the beloved actor's legacy and did so by giving a heartwarming performance in the Ritter-dedicated episode, "Goodbye." Yet it was her comedic talent and charisma on "The Big Bang Theory" that established Cuoco as one of television's most relatable and likeable young stars.