Lewis was born in Chelsea, London, the daughter of a judge and a barrister, and grew up in Kingston upon Thames.
[1] She intended to study International Relations at Durham University, but took a gap year, during which she applied to drama school[2] and earned a place at the (now defunct) Academy of Live and Recorded Arts (ALRA), though she switched from the three-year degree programme to the year-long foundation course to make time for her career.
[3] Lewis was 18 when she auditioned for what was initially a guest role in the first season of the BBC Two and HBO investment banking drama Industry, which premiered in 2020.
[4][5][6] Lewis also played Amy Wild in the Spanish-American AMC and Movistar+ adventure series La Fortuna starring the likes of Stanley Tucci and T'Nia Miller.
[7][8] Lewis has an upcoming role as Margaret in the BBC One medieval drama King and Conqueror.