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The movie is filming with Irish model Jamie Dornan as the dominant Christian and Dakota Johnson as his lover Anastasia Steele.
While set in Seattle, the film is shooting in Vancouver, Canada, and the stars were spotted all this month being put through their paces.
There have been rumblings about discord between author E.L. James and director Sam Taylor-Johnson.
Reportedly the pair had butted heads over the director's changes to the story.
The film - which sees some saucy S&M sex scenes played out - is not in theatres until Valentine's Day next year.