In 2011, Kirby debuted in the BBC production "The Hour". This was followed with a co-starring role as 'Estella' in the BBC mini-series "Great Expectations". In 2012, she appeared in “The Rise”, “Kill Command”, “Jupiter Ascending” and “Queen and Country”.
In 2015, she appeared in "Everest", followed by "The Dresser" and May 2015, was cast as 'Princess Margaret' in Netflix's first original Brit series "The Crown"…
…winning the 'British Academy Television Award for Best Supporting Actress'.
Kirby gained wider recognition for roles in action films "Mission: Impossible – Fallout" (2018) and "Hobbs & Shaw" (2019)...
...also winning a Venice Film festival 'Best Actress' award for her performance in the drama "Pieces of a Woman" (2020).