These ventures, combined with an array of licensing deals for their names and likenesses, made Olsen wealthy at a young age.
In 2004, Olsen's wealth was estimated at 7 million.
The National Labor Committee, which organized the pledge, later praised the twins for their commitment to worker rights.
In 2006, in an attempt to gain credibility in the fashion industry after their association with Wal-Mart tarnished their reputations, they were tapped as the faces of the upscale fashion line Badgley Mischka. During her time at the Campbell Hall School, she was on the school's horseback riding team.
The couple initially sparked wedding rumors in January 2013 when Mary-Kate was spotted wearing a ring on her left hand wedding finger during a trip to Paris.
Ashley Olsen and her significantly older boyfriend have gone on a double date with Mary-Kate Olsen and her significantly older husband.
The twins were spotted at a Knicks-Nets game at Madison Square Garden in NYC, according to reports, who is said to be in his late 60s. On the surface, Olsen and Sachs' date night looked totally normal.
The pair kissed, watched the basketball game, and sipped drinks. It's dizzying, then, to look over and see another couple — Mary-Kate Olsen and her 47-year-old husband Olivier Sarkozy — like a mirror image across the aisle.
In 2004, both Mary-Kate and Ashley took control of Dualstar, becoming joint-CEOs and presidents of the company, which at the time had its merchandise being carried in over 3,000 stores in America and 5,300 stores worldwide.
Olsen and her sister became co-presidents of Dualstar upon their eighteenth birthday.
She fatally continued with her acting career independently, appearing with a few guest-star roles in films and television shows, and with her last film being Beastly (2011).
In March 2012, both Mary-Kate and Ashley officially indicated their interest to retire as actresses in order to focus on their careers in the fashion industry.
In 1997, the Olsen twins guest starred in an episode of Sister, Sister, alongside rival twin actresses Tia Mowry and Tamera Mowry.