Danica McKellar: Danica McKellar. Actress: The Wonder Years. Together with her younger sister, Crystal McKellar, she began acting at a young age in her mother's dance studio. In 1982 the family moved to Los Angeles and a few years later she appeared in her first commercial. A few guest appearances in The Twilight Zone (1985) was followed by her breakthrough in The Wonder Years (1988). She has had good grades in math...
