The best scene - still zero nudity - was the 'threesome' on the couch.
Scroll down for video Share While the dress remained demure with a high choker neckline and knee-length hem, it was formed of a racy sheer material - which teased at her braless figure and plenty of smooth skin underneath.
The brunette was joined by co-star Sam Claflin at the event, who cosied up to his wife Laura Haddock on the carpet.
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Meanwhile the actress, 31, opted for a Victoriana-inspired gown, in homage to the film, formed of a structured jacket and bold ruffled skirt.
Not very comfortable with nudity and could try to keep it minimum as possible.