South African actress Charlize Theron has turned down a role in a new movie about the first person to undergo a sex-change operation.

Theron, 34, was to play as Gerda Wegener, the wife of artist Einar Wegener opposite Nicole Kidman, 42, in ‘The Danish Girl’, but she recently turned down the role.

Kidman will star and co-produce the project, which is adapted from David Ebershoff’s novel about Wegener, who underwent a procedure to become a woman in the early 1930s.

Tomas Alfredson, who will direct the film, is refusing to let the casting hiccup upset his filming schedule.

“We have been in talks for close to a year, and we are soon going into production,” Contactmusic quoted him as having told Daily Variety.