Rita Ora Cast as Christian Grey’s Sister in “Fifty Shades of Grey”

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Safe to say this is the most surprising casting news of the day.

Rita Ora is set to play Christian Grey's adopted sister Mia in the highly anticipated film adaptation of E.L. James' erotic thriller, "Fifty Shades of Grey."

"It's official! I've been cast in @FiftyShades of Grey as Christian's sister Mia. #FiftyShades," the British singer tweeted on Monday, Dec. 2.

The "How We Do" crooner will play the outgoing younger sibling of the BDSM-loving billionaire, played by "Once a Upon a Time" hottie Jamie Dornan, who was cast as the titular character after "Sons of Anarchy" star Charlie Hunnam exited the role.

PHOTO: See the first pics of Jamie Dornan and Dakota Johnson on set

Ora's acting credits include a small cameo in "Fast and the Furious 6," as well as a role in the British film "Spivs."

The 23-year-old singer-actress joins previously announced castmembers Dakota Johnson, who plays Grey's love interest Anastasia Steele, as well as Eloise Mumford (Anastasia's best friend Kate), Luke Grimes (Christian's brother Elliot), Victor Rasuk (Anastasia's close friend Jos), Jennifer Ehle (Anastasia's mother Carla) and Max Martini (who was most recently cast as Christian Grey's bodyguard).

Filming for the S&M-inspired flick commenced on Sunday, Dec. 1 in Vancouver, Canada, with author E.L. James sharing a behind-the-scenes glimpse on set.

NEWS: Charlie Hunnam says Jamie Dornan will make a "great" Christian Grey

And fans were also treated to the first on set pic of Dornan and Johnson filming in character at a cafe in the city's GasTown District, marking the first time the sexy pair have been photographed together since they covered the Nov. 22 issue of Entertainment Weekly.

Produced by Michael de Luca and Dana Brunetti and directed by Sam Taylor-Johnson, "Fifty Shades" is set to hit theaters on Feb. 13, 2015--just in time for Valentine's Day!

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