The Wicked star hit the red carpet in a striking gold dress, posing for photos and taking selfies with a number of fans.
Erivo, 39, declined requests for interviews from the gathered press, citing “vocal rest”.
Cynthia Erivo attends the "Prima Facie" Gala during the 70th BFI London Film Festival
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Cynthia Erivo
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Cynthia Erivo speaking with fans as she attends the screening of Prima Facie
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Cynthia Erivo poses for selfies at the "Prima Facie" Gala
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Prima Facie sees Erivo taking on the role of Tessa Ensler, a successful defence barrister from a working-class background.
Cynthia Erivo
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Cynthia Erivo attends the "Prima Facie" Gala
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Cynthia Erivo speaks on stage during the "Prima Facie" Gala
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The cast of Prima Facie on the red carpet at the London Film Festival
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The film is adapted by Suzie Miller from her 2019 stage play, which most famously saw Jodie Comer play the starring role.
Erivo was joined on the red carpet by co-stars including Toheeb Jimoh, Elizabeth Dulau, Harry Treadaway, and Khalid Abdalla, as well as director Susanna White and BFI Festivals Director Kristy Matheson.