There’s a reason the sex scene between Sienna Miller and Hayden Christensen in Factory Girl looks so real, it is. The pair had a brief fling during the month long shoot, and when it was time for reshoots six months later, they apparently picked up where they left off. New York Daily News says:

When it came time to shoot the love scene, word is the former lovers dispensed with the flesh-colored socks and pads favored by actors on less familiar terms. And, once the cameras were rolling, the two 25-year-olds fell into old habits…”It’s not simulated,” an insider tells us. “They’re really doing it.”

But Sienna’s rep denies the rumor, “She’s just a really good actress.”

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