Hilary Duff joins Beyonce, Lucille Ball, and Reese Witherspoon in the Barbie doll world. "Mattel's new Red Carpet Glam Hilary Duff Barbie Doll. Duff is the latest Hollywood star to take on 12-inch proportions as the world's most popular doll, Barbie." {Source} This is a great Christmas gift for tweens and all the Barbie collectors out there. Now that Hilary's a Barbie would her Barbie alter ego hook up with Kevin, Barbie's ex?!