The 'R.I.P.' singer uploaded the sultry poster to Instagram last night alongside the caption: "I like this. I can't wait till next year!"
Rita, 24, looks seriously stunning in the poster, pouting for the camera while showing off perfectly smoky eyes and a sleek bob with not a hair out of place.
Her look in this poster is slightly different to a previous one we have seen in which Rita was sporting much shorter hair.
She stars as the sister of billionaire businessman Christian Grey, whose unconventional relationship with publishing graduate Ana Steele provides the backbone of the story.
Christian is played by Northern Irish actor Jamie Dornan, while Dakota Johnson takes on the role of Ana.
Fifty Shades is based on the first book in the Grey trilogy by E.L. James and is released in cinemas on Valentine's Day next year.
Rita spoke about her role in the movie earlier this year, telling The Vodafone Big Top 40 that it had been an "incredible experience" for her on set.
"[It] took up a lot of my time as I didn't wanna embarrass anybody, so I made sure I knew exactly what I was doing."
"I went from not knowing what it's like being on a movie set, to feeling like I knew them all for years, and I wasn't even there for that long.
"They'd already been filming for months and months, so I came in mid-way through the film. I can honestly say it's so cool to be in it. I'm so excited, I was really nervous. I kind of came in last minute, I auditioned last minute."
This will be Rita's first major movie role. She has previously appeared in a cameo appearance in Fast & Furious 6.
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