"It's not simulated," their "insider" said. "They're really doing it."

    But Leslie Sloane Zelnick insists her client was merely acting.

    "It's not true at all," she told the New York Post. "When you do a love scene, there are five or six people on the set at a minimum. They weren't having real sex. She's just a great actress.

    Director George Hickenlooper refused to comment on the scenes.

    "You'll have to ask Sienna about that. We tried to portray it tastefully," he explained. Sienna and Hayden (Christensen) grew close during the filming. It was an emotional experience for us all."

    Standing with her parents after Tuesday's screening at New York's Tribeca Grand hotel, Miller said, "Oh darling that is so horrible. You obviously don't know anything about making movies.

    "We wanted to make it realistic and I watched it thinking, 'Oh my God, my dad's going to see it!' But we didn't want to hold back because it is a real and gritty film. It wouldn't fit in the film if we had an unrealistic sex scene."

    But there were reports, apparently endorsed by the movie's director, that the on-screen pair also became a pair in real life, for about a month.

    A "friend" of Hayden's revealed to the New York Daily News, "They spent about a month hanging out. But then she decided she didn't want a relationship. Hayden was devastated. He really fell for her."

    Miller and Hickenlooper both say the media has exaggerated singer Bob Dylan's negative reaction to their film, "Factory Girl." The film is about Andy Warhol muse Edie Sedgwick's ascent to superstardom, decline into drug use and untimely death at the age of 28.

    "I think he was concerned that the Bob Dylan character was portrayed as contributing to Edie's suicide, which isn't the case at all. I think the character is very sympathetic to Edie," Hickenlooper said in New York Tuesday.

    "It was all exaggerated within the press. There was no lawsuit filed," Miller said.

    "Legal letters were served, but no lawsuit was filed," Hickenlooper explained.

    Miller told "Access Hollywood" she "wouldn't change a thing" in the timing of her relationship with actor Jude Law. In the interview, scheduled to air Thursday, Miller said she wanted to set the record straight regarding her interview with Rolling Stone, in which she was quoted as saying: "I don't know, monogamy is a weird thing for me. It's an overrated virtue, because, let's face it we're all ... animals."

    Her comments were taken out of context, she said.

    "I said that although monogamy is something I hugely aspire to and respect," Miller said, "it is something that society has placed upon us and it's not always easy to be. I'm a very monogamous person."

    (Agencies)