Mary-Kate Olsen and Ashley Fuller Olsen (born June 13, 1986) are twin Danish-American actresses who have appeared in television and films since the age of nine months. Despite their near-identical looks, they claim to be fraternal rather than identical twins.

Born in Sherman Oaks, California to David Olsen and Jarnette Jones, the Olsens started their acting careers on the television series Full House in 1987. The show was widely popular during the late 80s and early 90s, and both sisters played one character, Michelle Tanner, taking turns during the tapings to do so, in order to comply with child labor laws regarding child actors. Because the producers did not want viewers to know that Michelle was played by twins, the sisters were originally credited as "Mary Kate Ashley Olsen", but later credited as separate people.