Lafont was born on 28 October 1938 in Nîmes, Gard, France. She has been married to Gérard Blain from 1957 until they divorced in 1959. Then she was married to Diourka Medveczky until they divorced. She had a daughter, actress Pauline Lafont (1963-1988). Lafont died on 25 July 2013 in Nîmes, Gard, France from cardiac arrest, aged 74.