The Oscar winner plays the Aussie hunk's love interest Dr. Jane Foster in this year's (13) superhero sequel Thor: The Dark World, but she was unable to attend a number of re-shoots as she was busy working on a new project.
Rather than hire another actress to stand in for Portman for a kissing scene, producers asked Hemsworth's wife Elsa Pataky to take her place.
Portman says, "It was for re-shoots (after the film was finished) and he was working in Hong Kong and I couldn't get there because I was working on my own film. So they put his wife in my wig and costume, that's why it is so passionate. It was such a perfect solution, wasn't it."