Mary-Kate Olsen is an American fashion designer, former actress, and producer. She began her acting career only nine months after her birth, sharing the role of Michelle Tanner with her twin sister (Ashley Olsen) in the television sitcom, Full House (1987–1995). The Olsen twins then went on to star in numerous films together for many years.

https://en.wikipedia.org/wiki/Mary-Kate_Olsen