Rita Ora has been cast in the role of Christian Grey's sister Mia in the upcoming film 'Fifty Shades of Grey.'
The 23-year-old British pop star confirmed the news on Twitter saying that she was officially a part of the erotic film based on the EL James' trilogy, CNN reported.
The shooting of the film, featuring Dakota Johnson as Anastasia Steele and as Christian Grey, began recently; it will be released in February 2014.