“Ain’t No Doubt About It” is the duo song by Addison (played by Meg Donnelly) and Zed (played by Milo Manheim) in the third ZOMBIES movie, released on July 15, 2022.

Milo and Meg had duets in the first and second movies. In the first film, their duets were “Someday” and its ballad version, and in the second film, it was “Gotta Find Where I Belong” and the duo’s reprise of the first film.