Actresses. Born June 13, 1986 in Sherman Oaks, California. The twin daughters of mortgage banker David Olsen and manager Jarnie Olsen, Mary-Kate and Ashley have become among the most popular—and bankable—female personalities in America. They made their acting debut in 1987 at nine months old, sharing the role of the youngest daughter, Michelle Tanner, on the ABC family sitcom Full House.
By the age of twelve, the girls had starred in home videos, feature films, multi-media entertainment and another ABC TV series, Two of a Kind. In addition to acting, the Olsens have become a huge force in girl marketing. On their 17th birthday, CNN announced the twins' total financial worth: $300,000,000. Products bearing their names, including computer games, dolls, and an enormously popular clothing line for Wal-Mart, are estimated to generate about $1 billion in retail sales alone per year. Mary-Kate and Ashley currently attend New York University.
Source :- http://www.biography.com/