Buckens was born on 9 August 1996[1] in Brussels and moved to England at a young age,[2] where she grew up in Kensington, London.
[6] Buckens' acting career began when she portrayed Émilie in Steven Spielberg's 2011 film War Horse,[7][8] a role she won after two auditions.
The character is a young French girl who lives on a farm with her grandfather after she lost her parents in the war.
[14] In 2018, Buckens starred in Ne M'oublie Pas (English: Forget Me Not), a French short film, as lead character Elsa.
[16][17] That same year, it was announced that Buckens had joined the main cast of the Cinemax action series Warrior.