Rita Ora teased "Fifty Shades of Grey" fans that they will be in for a "Shock" when they see the movie. The British singer was cast as Mia Grey, Christian Grey's adoptive sister.

"[It's] gonna be the biggest and most amazing shock ever,"Ora told MTV, The Independent reports.

The 23-year-old said she was "so excited" for fans to see the film. Originally the movie based on E.L. James' erotic novels was supposed to be released the summer of 2014 but was pushed back to Feb. 13, 2015. This is the first major acting role for the "Radioactive" singer.

She told MTV that at first she was nervous about starring alongside Jamie Dornan (Christian Grey) and Dakota Johnson (Anastasia Steele).

"Oh, I was nervous because it was the first time I ever did a movie with words," she said. "But it was so nice. The director Sam [Taylor-Johnson], she was incredible, so it was all love."

As for her character, Ora told E! News that Mia looks completely different than how she does in real life. The singer recently posted a photo from the set on her Instagram page. People assumed that the blonde beauty was channeling Mia in the photo but Ora said that wasn't true. 

 "It's a surprise. Hopefully you won't recognize me," Ora said. "It's sexy!"

Recently Universal Pictures released the first official movie poster from "Fifty Shades of Grey." In the simple yet intriguing picture, Dornan's Christian Grey has his back to the camera as he stares out the window at the Seattle skyline.

"Mr. Grey will see you now," the poster reads.

Johnson's Anastasia Steele is absent from the photo but did appear alongside the troubled, sexy billionaire in movie pictures a few months ago.