Duff is the latest Hollywood star to take on 12-inch proportions as the world's most popular fashion doll. She joins other famous (doll) faces such as Reese Witherspoon, Beyonce Knowles and Lucille Ball.
The Red Carpet Glam Hilary Duff Doll, which shows the 19-year-old's likeness in a polka-dot dress with a red satin sash, hits stores this month.
Duff, a singer, actress and fashion designer best known for playing TV's "Lizzie McGuire," has also designed clothes for Barbie.
The iconic blonde doll and the young Hollywood beauty are "great role models to girls and the perfect design duo," Jamie Wood, Mattel's vice president of Barbie marketing, said in a statement.
"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."