Boulogne was born in
Neuilly-sur-Seine on 11 August 1962. He was the son of German singer and actress
Nico. Nico always claimed that the biological father was French actor
Alain Delon, although Delon consistently denied paternity to Boulogne. He was initially raised by his mother before he was adopted by Delon's mother, Édith, and her second husband, Paul Boulogne, whose surname he legally took. Edith Boulogne said she always knew he was her grandson. He spent most of his childhood in
Bourg-la-Reine. In 2001 and 2019, Boulogne attempted to sue Delon for legal recognition of paternity, but without success. ==Career==