Sienna Miller’s publicist has denied the rumours that Sienna and Hayden Christensen actually had sex during the filming of Factory Girl.

An inside source told the New York Daily News that the couple got it on for a sex scene in the movie: “It’s not simulated. They’re really doing it.”

Director George Hickenlooper added fuel to the fire by saying the New York premiere on Monday: “Sienna and Hayden grew close during the filming. It was an emotional experience for all of us. We tried to portray it tastefully.”

And as for it being real, he just said: “I can’t comment. You’ll have to ask Sienna about it.”

Cue Sienna’s publicist: “When you do a love scene there is a minimum of five people in the room. There’s no real sex and the scene proves [Sienna] knows how to give a good performance.”

Sienna and Hayden were romantically linked during earlier filming and according to a friend of Hayden, he “really fell for her” but she wasn’t interested in a relationship: “Sienna wanted to try to make another go of it with [Jude Law]. But, again, it didn’t work out. At the end of last summer, she and Hayden ended up in Toronto for more shooting. They hadn’t talked in six months. But it turned out to be a great reunion.”