Dakota Fanning is set to star in Girls Night Out as Princess Margaret, the sister of Queen Elizabeth II, according to The Hollywood Reporter.
Fanning will play the teenage Princess Margaret in the film, directed by Michael Hoffman. Girls' Night Out will take place on Victory in Europe Day in 1945.
The two princesses are allowed out of Buckingham Palace for one night to join in on the festivities. The film chronicles their night out.
The role of Princess Elizabeth hasn't yet been cast.
Hoffman is currently working on Gambit starring Colin Firth and Cameron Diaz.