Mary-Kate Olsen & Ashley Fuller Olsen (born June 13, 1986) are American actresses, fashion designers and producers. The identical twins made their acting debut as infants playing Michelle Tanner on the television series Full House. At the age of six, they began starring together in TV, film, and video projects, which continued to their teenage years. Through their company Dualstar, the Olsens joined the ranks of the wealthiest women in the entertainment industry at a young age.