One half of Mary-Kate and Ashley, American sisters who became child stars after starting acting at the grand old age of nine months. They carried on doing every kind of TV, book and product promotion you can imagine - imagine Donald Trump reinvented as a small blonde pair of twins. By 2007 Forbes had ranked the twins as the eleventh-richest women in entertainment, with an estimated net worth of $100 million - at the age of 21. They now have a rather classy fashion line called The Row and have become regulars at the front row of fashion shows, where their skinny, angular looks mean they are often mistaken for coat hangers.