Eric Summer Director Éric Warin Director Elle Fanning Félicie Voice Nat Wolff Victor Voice Carly Rae Jepsen Odette Voice Maddie Ziegler Camille Voice Mel Brooks Luteau Voice Kate McKinnon Regine, Mother Superior, Felicie's Mother Voice Tamir Kapelian Rudolph, Mathurin Voice Julie Khaner Regine Voice Joe Sheridan Director of Opera Voice Elana Dunkelman Dora, Rosita Voice Shoshana Sperling Nora Voice Dane DeHaan Victor Voice Terrence Scammell Merante Voice Jamie Watson Greasy Guard , Janitor Voice Bronwen Mantel Mother Superior Voice Carol Noble Screenwriter Laurent Zeitoun Producer Yann Zenou Producer Nicolas Duval-Adassovsky Producer Andre Rouleau Producer Valérie d'Auteuil Producer Jean Aubert Executive Producer Jericca Cleland Cinematographer Yvann Thibaudeau Film Editing Klaus Badelt Original Music Robyn Klein Casting Lucie Robitaille Casting Bonnie Timmermann Casting Cyril Holtz Sound