Mary-Kate Olsen net worth: Mary-Kate Olsen, half of the famous Olsen twins, has a net worth of $150 million. And that net worth has been attained through a diverse and eclectic revenue stream that includes acting, producing, writing, and fashion design. Her career began at the tender age of nine months, when she and her twin sister Ashley got the role of Michelle Tanner on Full House, which would go on to be hugely popular and serve as the foundation on which the "Olsen twins" brand would be built. One of the interesting aspects of the Michelle Tanner role is that both twins took turns playing her. The reason for this unusual acting conceit was to sidestep child labor laws which restricted the amount of time a child could act in front of the cameras. By casting twins, the savvy producers of Full House were able to double the amount of available Michelle Tanner time.
In 1995, the massively popular Full House ended its run, but the Olsen twins did not. They continued to merchandise their likeness on everything from clothing and makeup to a series of direct to video movies such as their "The Adventures of Mary-Kate and Ashley" series. Since their childhood stardom, Mary-Kate has worked as an actress in a variety of roles, including the role of "Union" in The Wackness.