Her father, Sheldon, is the son of Polish Jews who survived the horrors of the Holocaust.
While studying 19th Century Russian Literature with a minor in film at Montreal's McGill University, modest Mia kept her burgeoning film career to herself and avoided answering questions about her future.
Actress Egerton attended Ditcham Park School near Petersfield in Hampshire, where she says she was bullied.
At the age of 11, while walking with her mother, writer Francoise Mesquida, she was spotted by director Manuel Pradal who cast her in Mary from the Bay of Angels Marie Baie de Anges.
Mia grew up alongside her younger sister, Lauren Kirshner.
Mia Kirshner Mia Kirshner laying on a bed with Karina Lombard on top of her lesbian kissing her and feeling up her breasts.