Melissa Joan Hart started acting in commercials at age four, which led (presumably) to her fascination with Shirley Temple--not a great role model if you want to land in the Skin Hall of Fame. Her first big break came in the form of the Nickelodeon series Clarissa Explains It All, in which she played the title character. However, it was Sabrina, the Teenage … Join Mr Skin to read her entire Biography