In 2006 when Berenice was on the set of OSS 117: Cairo, Nest of Spies, she fell in love with French director Michel Hazanavicius. Michel Hazanavicius is also a well known producer, screenwriter and film editor. Few months later she got married to him. They have also been parents twice.
Berenice was born to Miguel Bejo who is a reputed Argentine filmmaker. She was influenced in acting since she was child. She made her acting debut in 1993 and that was in Pain perdu. In 1996, she appeared in several movies and television series. She is also known for starring the role of Lila in the TV series, Julie Lescaut. In 2001, she portrayed the role of Christiana in the American movie, A Knight's Tale. Her breakthrough role came in 2011 when she appeared in the movie The Artist playing the role of Peppy Miller. For this role, she earned the salary of €250,000.