Mimi Ndiweni (born 31 August 1991) is a British actress of Zimbabwean descent, best known for playing Tilly Brockless in the television series Mr Selfridge, and Ester in the stage production of The Convert at The Gate Theatre in London. She has also appeared on film in Cinderella and The Legend of Tarzan.She won the Spotlight Prize in 2013 and went on to work for the Royal Shakespeare Company after graduating from Royal Welsh College of Music and Drama. Mimi was also featured as One to Watch by the Independent in 2013, and was on the Evening Standard's Stars of 2015 list after performing in the RSC's Midsummer Mischief Festival.