The rumors started after the pair became close during the shoot and were exacerbated on the film's release, when moviegoers got to see graphic scenes of the couple cavorting.
But Miller is keen to quash the claims, her publicist insisting, "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 she knows how to give a good performance."
The actress recently revealed she was terrified about watching the sex scenes at a screening of the film which she attended with her parents. She said, "I was sitting next to my dad and I just literally leaned over and put my hands over (his eyes). It's quite embarrassing. I can't even watch it!"
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