After taking part in the musical comedy Notre-Dame-de-Paris created by Luc Plamondon and Richard Cocciante when she was just 14, she played in Les Dix commandements at age 16.

In 2007, she released her first sole self-titled album Marie-Ève Janvier with Mercury (Universal) France.

In the summer of 2009, they recorded their first joint album entitled Donner pour donner, followed in 2011 with a second joint album La vie à deux.

Their joint single "J'ai un problème", a cover of a 1973 Johnny Hallyday and Sylvie Vartan song, became a big hit for Marie-Ève Janvier and Jean-François Breau.

On the March 3, 2016, having been a steady couple since 2004, Janvier and Breau welcomed their first child, Léa, into the world.