No she doesn't. On the Lizie Mcguire movie the person who plays Isabella was Hilary Duff too it's just a computer they make Lizie head appear and someone's elses body.
my little sister really wan'ts to know who is the older sister, Hilary or haylie duff. oh and one more thing, where can a girl find a cheap Hilary duff CD? haylie duff is 2 and a half years older...