Actress/singer Hilary Duff has been transformed into a Barbie doll, after already designing clothes for the fashion doll. The LIZZIE MCGUIRE star, who recently split from ex-boyfriend Joel Madden, joins Reese Witherspoon and Beyonce Knowles in being immortalised as the iconic doll. Barbie marketing vice president JAMIE WOOD says, "Not only are they two of the most stylish entertainers, actors and fashion designers, but they also show girls there are no limits to what they can do."