Paolo Valisari is the main antagonist of The Lizzie McGuire Movie. He is a famous and handsome Italian pop star who plans on using Lizzie to avoid being sued for a contract breech.
Paolo and his singing partner/girlfriend, Isabella Parigi, were to present an award at the International Music Video Awards, but they had a falling out (possibly because of his lip-syncing). For revenge, Paolo takes matters into his own hands.
When Lizzie and her graduating class arrive in Rome for their trip, Lizzie strays away from her class and meets Paolo at a wishing well. Paolo notices Lizzie's resemblance to Isabella. They agree to meet the next day at the Trevi Fountain. Lizzie pretends to be sick and sneaks off to meet Paolo, but they are nearly caught. They elude her class with Paolo's bodyguard, Sergi.
Paolo tells Lizzie that she has to take Isabella's place at the International Music Video Awards. He says it's to keep Isabella from being sued, and that she has to lip-sync their hit song What Dreams Are Made Of. They sneak around preparing for the event while Gordo covers for them, and Lizzie becomes romantically attached to Paolo.
Soon the media takes notice of Lizzie, mistaking her for Isabella with dyed hair (Lizzie is blond while Isabella has black hair). Apparently this is part of Paolo's plan.
On the day of the concert, Miss Ungermyer discovers one of her students has been skipping, and Gordo takes the fall for Lizzie. Cut out of the class, he heads to the airport, where he meets the real Isabella, who saw a tabloid with Lizzie's picture demanding an explanation. Gordo tells her what happened and learns Paolo's plan to frame Isabella for lip-syncing, humiliating Lizzie in the process.
During the concert, Isabella and Gordo race to the IMVA, being held at the Colosseum. They meet up with Lizzie in time to convince her of the truth. As Lizzie and Paolo sing their duet, Gordo and Isabella expose Paolo by unplugging his record tape. Isabella further humiliates Paolo by walking on stage next to Lizzie. Angry at being exposed, Paolo leaves and argues with Sergi, who is disgusted at what he had planned and quits, leaving Paolo to the paparazzi.