Kidman, Zellweger and Law on 'Cold Mountain'

Nov. 21 -- Two of Hollywood's hottest leading ladies spent seven months cut off from the modern world in an isolated Romanian village with a young, handsome leading man filming a Civil War epic. Of course, the movie fueled racy rumors.

Watch the full interview tonight on 20/20.

Nicole Kidman, Renée Zellweger, Jude Law sat down with 20/20's Barbara Walters to talk about their upcoming film, Cold Mountain.

The film, which opens Christmas Day, is a sweeping Civil War epic based on the best-selling novel by Charles Frazier. Law plays Inman, a Confederate soldier who becomes disillusioned with war and sets out on a journey back home to the town of Cold Mountain in North Carolina. Kidman plays Ada, the daughter of a minister who moves to Cold Mountain and finds herself unprepared for the hardships of war. Zellweger plays Ruby, a backwoods country girl who teaches Ada how to survive.

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Neither woman wants to publicly state the name of men in their lives, but it is well known that Zellweger was seeing rock star Jack White of The White Stripes, and Kidman is dating rocker Lenny Kravitz. But Kidman and Law did set the record straight on their alleged love affair on the set of Cold Mountain.

Kidman says their on-screen love scene was strictly on the set. "It's like we know each other in a very deep way now. I've kissed the man when the cameras were rolling. You know, so it's slightly unusual. I've lain there when the cameras are rolling. I mean, that's not, you know, the norm, but nothing gets crossed over into your personal lives," Kidman told Walters.

Law's personal life was in turmoil throughout the production of Cold Mountain. Last month, he was divorced from his wife, actress Sadie Frost. They have three young children. And just recently, it's been reported that he's involved with 20-year-old British actress Sienna Miller. Through it all, the one thing that's kept him going seems to be his acting.