50 Shades of Grey: Rita Ora cast as Jamie Dornan's sister Pop star Rita Ora has annnounced that she will join the Fifty Shades of Grey cast in her first major film role. Ora was at attendance at the British Fashion Awards 2013 when she broke the news. Her website confirmed the announcement. The 23-year-old will play Mia, the adopted younger sister of Christian Grey, the billionaire who embarks upon a passionate affair with student Anastasia Steele. The Hot Right Now singer, who was born in Kosovo, former Yugoslavia, had more number one singles in the UK charts in 2012 than anybody else. However, she has made forays into the acting world before. Ora was educated at the Sylvia Young Theatre School and has appeared in 2004 film Spivs and more recently Fast & Furious 6.