Baye was born in Mainneville, Eure, Normandy to Claude Baye and Denise Coustet, two painters.[2] At 14, she joined a school of dance in Monaco. Three years later she went to the United States. On returning to France, she continued with dance but also registered for the Simon Course and was admitted to the Conservatoire, from where she graduated in 1972 with a second prize in comedy, dramatic comedy, and foreign theatre.
Career
Her second cinema appearance was in Two People (1973), directed by Robert Wise. She became better known as the script girl in Day for Night (La Nuit américaine, 1973) by François Truffaut. Throughout the 1970s, she played the good girlfriend or nice provincial girl in film and television.
Baye won two more César Awards, Best Supporting Actress, for Strange Affair (Une étrange affaire, 1981), and Best Actress for La Balance, 1982). Her four-year relationship with Johnny Hallyday made them a celebrity couple and their daughter is Laura Smet, now an actress.
After changing her image by playing a streetwalker in La Balance, she widened her scope with more obscure characters in J'ai épousé une ombre (1983) and En toute innocence (1988). In 1986, she returned to the theatre with an interpretation of Adriana Monti.