Mary-Kate Olsen (born June 13, 1986) is an American actress, fashion designer, producer, author, and businesswoman. Having risen to fame as a child star alongside her twin sister Ashley Olsen, Olsen pursued acting independently as an adult until 2012.

Mary-Kate and Ashley were born in Sherman Oaks, California to David Olsen (b. 1953) and Jarnette "Jarnie" Fuller (b. 1954). Despite being very similar in appearance, they are not identical. They have an older brother, Trent, and a younger sister, Elizabeth Olsen, and two younger half siblings Taylor and Jake from their father's second marriage. Mary-Kate and Ashley's parents divorced in 1995.

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