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Tom Hiddleston is trying to right one of Hollywood's biggest injustices by showing moviegoers his hot naked butt in Crimson Peak.

"It's so often in movies that women are more naked than men and that's unfair," the actor tells E! News. "We wanted to sort of redress the balance."

But there's also an artistic reason for his nudity in the Gothic horror film (in theaters Oct. 16).

"I didn't have a problem with the nakedness because I felt that there's always been a strain of sexuality in Gothic romance as much as there has been the fear of death and the threat of violence," Hiddleston explained. "It's a very violent film and I felt like we needed to balance that. So if we're going to bring up the violence we needed to bring up the sense of sexuality."

Tom Hiddleston, Mia Wasikowska, Crimson Peak

Universal Pictures

 In the film, which takes place in the early 20th century, Mia Wasikowska is an aspiring writer who moves with her new husband (Hiddleston) to his family estate in England where she not only sees ghosts and spirits but where she also must live with her mysterious sister-in-law (Jessica Chastain).

Directed by Guillermo Del Toro, the film's cast also includes Charlie Hunnam and Supernatural's Jim Beaver.

Chastin celebrated her birthday not long after they started shooting the movie in Toronto.

"I don't normally have birthday parties and I had a birthday party and all my girlfriends from all over the country flew in and Tom joined us and we all went karaoking and played ping pong and danced," Chastain said.

Her top karaoke number? Barbra Streisand and Neil Diamond's "You Don't Bring Me Flowers"

"It takes a lot of drinks to get me there but that's my number one," the Oscar nominee said.

Hiddleston said he belted out "Piano Man." "It's a little high for me," he said. "Billy Joel is one of the great vocalists alive working today and I have quite a low baritone."

Chastain previously revealed to E! News that Hunnam marked her birthday with an "incredible thoughtful birthday present, this amazing artist and this book of photographs."

Jessica Chastain, Crimson Peak

Universal Pictures