Became a TV star portraying Michelle Tanner at nine months old on the series Full House, sharing the role with her fraternal twin sister Mary-Kate Olsen. The twins starred in a number of films in the '90s and also went on to run their own fashion brands.
She and Mary-Kate were born in Sherman Oaks, California to Jarnette and David Olsen.
Among the many movies she and Mary-Kate star in as young actresses are It Takes Two, Billboard Dad and Passport to Paris.
In January 2014, she began dating director Bennett Miller, who is 20 years older than her.
Her younger sister Elizabeth Olsen starred in the 2011 thriller Martha Marcy May Marlene and the 2014 blockbuster Godzilla.