Melissa Joan Hart (born April 18, 1976) is an American actress who is best known for playing the title roles in two successful television series, Clarissa Explains It All and Sabrina, the Teenage Witch. Hart also recorded an album as Clarissa entitled This is What 'Na Na' Means. It was mostly a novelty product and did not sell well, receive critical attention, or place in any charts. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.