Starred in the ABC sitcom Full House, sharing the role of Michelle Tanner with her fraternal twin sister Ashley Olsen. She and Ashley then went on to star in a number of movies and launch their own clothing lines. They founded the luxury fashion brand The Row in 2006.
The twins were cast onto Full House when they were just nine months old.
She and Ashley starred in a musical mystery video series entitled The Adventures of Mary-Kate & Ashley from 1994 to 1997.