Rita Ora confirms she has been cast in Fifty Shades of Grey

has landed her first major acting role — in the new

film.The British singer announced that she will be playing Christian Grey's sister Mia on Twitter on Monday night, while attending the British Fashion Awards 2013."It's official!," the excited 23-year-old wrote. "I've been cast in @FiftyShades of Grey as Christian's sister Mia."

© Photo: Getty Images

Talented Rita studied acting while attending the Sylvia Young Theatre School, and in the past appeared in the 2004 film

, as well as last year's

alongside the late Paul Walker.The news means that she will soon be jetting over to Vancouver to join

and

, who

as Anastasia Steele and Christian Grey at the weekend.The actors were pictured on the first day of shooting, filming a coffee date between 27-year-old millionaire Christian and college senior Ana.

© Photo: Splash

Handsome Northern Irish actor Jamie, 31, was dressed in a dark three-piece suit and an unbuttoned white shirt for the scene, while Dakota, 24, wore a khaki military-style jacket with a blue and white scarf around her neck.It was announced in June that British director Sam Taylor-Wood would helm the highly-anticipated screen adaptation of E. L. James' hit book.Production was pushed back by a month after

actor Charlie Hunnan

, weeks after he was cast as the leading man.The release date for the first installment of the

trilogy is set for February 2015.