Gwyneth Paltrow will join Nicole Kidman in “The Danish Girl,” an adaptation of the David Ebershoff novel that tells the story of a relationship between the first post-operative transsexual, Einar Wegener, and his wife Greta.

Thomas Alfredson (“Let the Right One In”) is directing a script by Lucinda Coxon. Gail Mutrux, Anne Harrison and Linda Reisman are producing, along with Kidman and Per Saari.

One afternoon in 1920s Copenhagen, Greta, a portrait painter, asked her husband to stand in for an absent female model. Slipping on a dress, stockings and woman’s shoes began a metamorphosis into Lili. When the photos became wildly popular, Greta encouraged her husband to do more, but a harmless game evolved into something deeper that threatens their marriage.

Kidman had already been attached to play Einar, and Paltrow will play Greta, who stood by her partner through the sex-change operation, finally letting go when she realized the man she married no longer exists. .

Footprint Investments LLC is financing, and international sales are being handled by Kathy Morgan at KMI. Pic is a coproduction between Pretty Pictures in association with Harrison Productions and Blossom Films.

Paltrow most recently wrapped “Iron Man 2,” which opens May 7, 2010.

She’s repped by UTA and Brillstein Entertainment Partners.

Source: Variety.com