The Olsen twins, Mary-Kate and Ashley, became famous as actors. But in 2004 they also released a popular line of clothing. They put together many fashion shows to display their new style. One of the fashion shows doubled sales of their clothing. Of all the items the twins have sold, clothing is among the most popular. In 2010, yearly sales of the twins' products netted about $1 billion, and clothing made up about three-quarters of those sales.