Ashton Kutcher has revealed that he created his on-screen chemistry with Natalie Portman by arguing.
The duo star together in Ivan Reitman's rom-com No Strings Attached and their rapport positively sparks.
"You know, I always feel like in order to create on-screen chemistry, you have to argue with someone well and Natalie and I both really pride ourselves on being right and so I think it just came naturally," he said.
"It's easy when you like the person and Natalie is very likeable. Natalie could have chemistry with a carpet if she wanted to. I don't know if chemistry is something you can manufacture."
But he refused to divulge what the pair argued about.
"Well it's a brilliant screenplay and these two characters are pivoted. That character position sets up the perfect argument. This film is trying to intellectualise love," he said.
Ashton is full of respect for his co-star, saying: "I believe she's one of the best actresses of my generation. It's a challenge to be as honest as she is."
:: No Strings Attached opens in cinemas on February 25.