The film took up to 7 years from the earliest creative discussion to the final release.
The film was officially filmed in London on October 9, 2010, and the shooting cycle was about seven weeks. Williams’ styling is based on the styling in Marilyn’s movie "The Dragon and the Phoenix". Except for downtown London and its surroundings, most of the scenes of the film were shot in the studio of Pinewood Studios. This studio was at that time. The dressing room used by Williams was also Monroe's dressing room during the filming of "The Dragon and the Phoenix".
British actor Emma Watson plays Monroe's costume assistant Lucy, which is also her first film role after the end of the "Harry Potter" series.
