Director Sam Raimi on the set of 'Spider-Man 3' at Madison Park. New York City, USA - 26.05.06

The moviemaker took the couple out for a meal and was stunned when it suddenly dawned on him that they might be an item.

He recalls, "I'm so dumb, because I met with them for dinner one night during the shooting to talk about the next day's scenes.

"I go, 'OK, well, that's it for the meeting,' and then I ask Kirsten, 'Can I drive you home?'

"They look at each other and she goes, 'No, no, I'm going to play a game of Touch 10 with Tobey...' It was some game.

"I thought, 'That's weird. She's got to work tomorrow.'"

Source: WENN