Ashley and her fraternal twin sister Mary-Kate were born in Sherman Oaks, California to David Olsen (born 1953) and Jarnette Fuller (born 1954). Despite being very similar in appearance, they are not identical. They have an older brother, Trent, a little 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.
Ashley Olsen is older than Mary-Kate by two minutes.
In addition to acting, the Olsens have become a huge force in girl marketing. Products bearing their names, including computer games, dolls, and an enormously popular clothing line for Wal-Mart, are estimated to generate about $1 billion in retail sales alone per year.
She co-founded luxury fashion brands The Row, Elizabeth and James, and the more affordable lines Olsenboye and StyleMint with her fraternal twin sister Mary-Kate Olsen.