Related Information for Mary-kate & Ashley Olsen Mary Kate Olsen and Ashley Fuller Olsen (born June 13, 1986) are American actresses and entrepreneurs. They are fraternal twins who have appeared in television and films since infancy. Since then, they have attained international fame through numerous television programs, films, interviews, as well as commercial endorsements. As a rule, they appear together, and have filmed movies worldwide, including in London, Sydney, Paris, New York City and Rome.They are reported to be worth $150 million eac.. read more