The Lizzie McGuire Movie is a comedy film which was released by Walt Disney Pictures. The finale of the television series Lizzie McGuire, it was the first theatrical film based on a Disney Channel original series. The film stars Hilary Duff, Adam Lamberg and Yani Gellman, and narrates Lizzie's graduation trip to Rome. The film begins as Lizzie McGuire (Hilary Duff) prepares for her junior-high graduation with her best friend, David "Gordo" Gordon (Adam Lamberg). During the ceremony, Lizzie trips onstage and accidentally brings the curtain down on her fellow graduates; this causes her to be teased by her nemesis, Kate Sanders (Ashlie Brillault), and her younger brother Matt (Jake Thomas). After graduation, Lizzie and her class embark on a trip to Rome chaperoned by their strict high-school principal, Angela Ungermeyer (Alex Borstein). To their dismay, Lizzie and Kate are assigned to the same hotel room. Their class visits the Trevi Fountain, where Lizzie is approached by Paolo (Yani Gellman)—an Italian pop star who mistakes her for his singing partner, Isabella (also played by Duff).