Rita Ora has given "Fifty Shades of Grey" fans a sneak peak at the character she'll be playing in the upcoming movie adaptation of the sexy bestseller.

The 23-year-old pop singer shared a photo of herself on Instagram last week dressed in character as Mia, the adopted sister of Christian Grey. In the photo she is sporting a classic glamor look with her hair curled in platinum blonde vintage waves. She is also wearing a cropped black jacket and plunging black lace top. She captioned the pic, "Hey Vancouver...," the city in which the movie is currently being filmed.

A source confirmed with E! Online that Rita has already started shooting the movie.

"She doesn't know how long she'll be filming for. She only found out she got the part a few months ago. They're trying to keep everything very secretive. If they would have started casting earlier it would have been harder for people to keep quiet about it," said the insider.

While the erotic novel is known for its raunchy sex scenes, there are rumors that the film may be much more modest so that it can avoid an NC-17 rating which forbids children under 18 from seeing it.

According to Sunday People, a source said that "It's less racy than the book."

The erotic romance novel "Fifty Shades of Grey" became an international bestseller and has been translated in 52 languages since its release in 2011. So far, the "Fifty Shades" trilogy has sold more than 90 million copies worldwide in e-book and print, making it one of the fastest-selling book series in history.

Fifty Shades of Grey is set to be released on February 13, 2015, reports Metro.Uk.