Mary-Kate and Ashley Olsen Are 38 Today! Relive Some of Their Cutest Childhood Moments Mandy Moore Recalls 'a Lot of Drama' and Fighting 'Over a Boy' on Set of 2003 Vanity Fair Famous Teens Shoot ...

Mary-Kate Olsen is an American fashion designer, entrepreneur and actress. She rose to fame in 1987 as Michelle Tanner on Full House, a role she shared with her twin sister Ashley Olsen.