Question: When was the English-French actress born, that starred in the 1975 film "Sept morts sur ordonnance", who had a prolific career as an actress in British and French cinema?

Context paragraphs:
Gustave Huberdeau: Gustave Huberdeau (10 May 1874 – 31 May 1945) was a French operatic bass-baritone who had a prolific career in Europe and the United States during the first quarter of the twentieth century.  He sang a wide repertoire encompassing material from French composers like Gounod and Massenet to the Italian grand operas of Verdi, the verismo operas of Mascagni, and the German operas of Richard Wagner and Richard Strauss.  He sang in numerous premieres during his 30-year career, including the original production of Puccini's "La rondine" in 1917.  Although possessing a rich and warm voice, Huberdeau had a talent for comedic portrayals which made him a favorite casting choice in secondary comedic roles as well as leading roles.  After retiring from opera in 1927, Huberdeau remained active as a performer in stage plays and in French cinema throughout the 1930s.

Michèle Morgan: Michèle Morgan (] ; 29 February 1920 – 20 December 2016) was a French film actress, who was a leading lady for three decades in both French cinema and Hollywood features.  She is considered to have been one of the great French actresses of the twentieth century.  Morgan was the inaugural winner of the Best Actress Award at the Cannes Film Festival.  In 1992, she was given an honorary César Award for her contributions to French cinema.

Margaret O'Brien: Margaret O'Brien (born Angela Maxine O'Brien; January 15, 1937) is an American film, radio, television, and stage actress.  Beginning a prolific career as a child actress in feature films for Metro-Goldwyn-Mayer at the age of four, O'Brien became one of the most popular child stars in cinema history and was honored with a Juvenile Academy Award as the outstanding child actress of 1944.  In her later career, she appeared on television, on stage, and in supporting film roles.

Sacramento French Film Festival: The Sacramento French Film Festival is an annual film festival held on the last two weekends of June at the Crest Theatre in Sacramento, California.  It celebrates the present as well as the rich history of French cinema featuring new releases and rarely seen classics.  It is the only festival dedicated to French cinema in Northern California and one of only two on the West coast.  It was described in the "Sacramento Bee" in July 2003, as “the Cinematic Highlight of Sacramento's Summer”.

Jane Birkin: Jane Mallory Birkin, OBE (born 14 December 1946) is an English-French actress, singer, songwriter, and model.  She attained international notoriety for her decade-long musical partnership with Serge Gainsbourg, and also had a prolific career as an actress in British and French cinema.

Paul Arcand: Paul Arcand (born May 12, 1960) is a Canadian radio host, journalist and film producer.  He was a popular francophone radio host for many years.  His latest film is "Québec sur ordonnance" a documentary filmed with a point of view, on the subject of Quebecers taking ever more prescribed medication.  Quebec has public health care, financed by government.

Sept morts sur ordonnance: Sept morts sur ordonnance (English: "Seven Deaths by Prescription" or "Bestial Quartet" ) is a 1975 French film directed by Jacques Rouffio and starring Michel Piccoli, Gérard Depardieu, Jane Birkin, Marina Vlady, Charles Vanel and Valérie Mairesse.

Gabriella Wright: Gabriella Wright (born June 19, 1982) is an English-French actress and model, best known for playing Queen Claude of France in the series "The Tudors" and Viola in the film "The Perfect Husband".  She recently played a significant role as Gina in the action thriller "The Transporter Refueled".

Vivienne Chandler: Vivienne Chandler (November 6, 1947 – June 6, 2013) was a retired English-French actress who became a professional photographer following her acting career.

Jean Gabin: Jean Gabin (] ; 17 May 190415 November 1976) was a French actor and sometime singer.  Considered a key figure in French cinema, he starred in several classic films including "Pépé le Moko" (1937), "La grande illusion" (1937), "Le Quai des brumes" (1938), "La bête humaine" (1938), "Le jour se lève" (1939), and "Le plaisir" (1952).  Gabin was made a member of the Légion d'honneur in recognition of the important role he played in French cinema.

Supporting paragraphs: Sept morts sur ordonnance Jane Birkin
Answer: 14 December 1946