Although fans only saw a little bit of Rita Ora in the new trailer for Fifty Shades of Grey, the singer turned actress is certainly in the film. Ora plays Christian Grey's (Jamie Dornan) sister Mia.

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This is Ora's first big film role and she admits she was quite nervous about the part. "Being new to the world of auditioning, for actors this may be a reoccurring thing, but I didn't know there were so many call backs," Ora told Access Hollywood on Tuesday. Ora had eight call backs in total to land the coveted role.

"I was a bit kind of stressed out during the audition process," she admitted, "but then when I got that phone call I was so happy. I couldn't wait to tell everybody."

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Ora also admitted that being on the Fifty Shades of Grey set was also nerve-wracking, but star Dakota Johnson (who plays Anastasia Steele) helped her through it.

"She's a great friend of mine," Ora said. "She really eased me and she was really nice to take care of me." Another person taking care of her was the set guy who would feed her lines! Ora said she was "so nervous" that she would "forget everything" she learned previously. It was extra hard because the British singer had to master an American accent for the role.

Fifty Shades of Grey is expected in theatres February 2015.

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