One thing Gellman was able to share, though, is that he's an “okay” singer who “can carry a tune,” but “probably a slightly different style than a lot of the pop ballads in the movie.” Since wrapping the film, he's been working a lot on his singing voice to improve it and he “can tell you that much.”

Did Yani Gellman actually sing in the Lizzie McGuire Movie?

A ballad version, sung by Paolo Valisari (Yani Gellman) and Isabella Parigi (Haylie Duff, singing voice), was used by Paolo and Lizzie McGuire (Hilary Duff) during their rehearsal for the International Music Video Awards, where Lizzie has to lip-synch Isabella's singing.

Who sings in The Lizzie McGuire Movie?

Haylie Duff Was Isabella's Singing Voice.