The movie is merely an extension of Duff's popular Disney television show where she plays the superficial title character Lizzie McGuire a recent middle-school grad, here on a two-week class trip to Rome. But, after a day of touring the sites with her bossy tour guide Miss Ungermeyer (Alex Borstein), her best friend Gordo (Adam Lamberg) convinces Lizzie they should dump the group and find their own adventure. Lizzie is eventually pulled aside by an Italian pop star named Paolo (Yani Gellman) who thinks she is a dead ringer for his former singing partner, Isabella. We learn Isabella is refusing to appear with Paolo at an upcoming music awards show and that he needs Lizzie to double as Isabella to avoid a publicity nightmare. The shallow, starstruck Lizzie naturally obliges.
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