The Olson Twins

Source: onehallyu.com
Mary-Kate and Ashley Olson have come a very long way from playing the baby sister to the Tanner clan on “Full House.” The two girls shared the role as twins, each one utilizing the parts of their personalities that were better suited to the particular scene that was being shot.
They are still working together today, but this time it is for their own companies. They formed “Dualstar Entertainment Group” to protect their assets and provide for their careers as they grew up. They have done a lot of projects since the days of taping Full House, some of which have worked out well.

Source: latimes.com
Under Dualstar Entertainment, the twins have made several low budget movies and a pile of teen merchandise that had their names on it. Since they have been grown-up, they have launched several clothing lines for different fashion tastes. Their main line, “The Row” has done quite well, and has helped the girls amass a net worth of about $1 Billion.