 Vanasse was born in Drummondville, Quebec, the daughter of Conrad Vanasse, a council worker, and Renée (née Gamache), who was her manager at the beginning of her career.At the age of nine, Vanasse expressed her desire to sing or to act and she fulfilled that wish when she appeared in the teen show "Club des 100 watts" after winning a "lip sync" competition.It was then, with the help of her mother, that Vanasse began to audition for, and take part in, TV commercials and to play minor and supporting roles in various French Canadian TV movies.