Vanessa Nuala Kirby (born 18 April 1987 or 1988) is a British actress. She began her career on stage, giving acclaimed performances in the plays All My Sons (2010), A Midsummer Night's Dream (2010), Women Beware Women (2011), Three Sisters (2012), and A Streetcar Named Desire (2014) as Stella Kowalski. Kirby's screen breakthrough came with portraying Princess Margaret in the Netflix drama series The Crown (2016–2017), earning the BAFTA Television Award for Best Supporting Actress and a nomination for the Emmy Award for Best Supporting Actress. Further acclaim came for headlining the melodrama film Pieces of a Woman (2020), receiving the Volpi Cup for Best Actress and nominations for the Academy Award and BAFTA Award for Best Actress. Kirby developed her career with starring roles in the action films Hobbs & Shaw (2019) and two Mission: Impossible films (2018–2023), and in the historical drama Napoleon (2023) as Empress Joséphine. She also portrays Sue Storm / Invisible Woman in the Marvel Cinematic Universe (MCU), beginning with The Fantastic Four: First Steps (2025).