Hugh Jackman

Hugh Jackman says he's "heartbroken" by the Internet leak of his upcoming film, X-Men Origins: Wolverine.

"It's a serious crime and there's no doubt it's very disappointing — I was heartbroken by it," Jackman told reporters at a Sydney promotional event for the movie. "Obviously people are seeing an unfinished film. It's like a Ferrari without a paint job."

A work print of the X-Men prequel, which explores the early days of the adamantium-infused mutant, appeared on file-sharing sites last week, a month before the film's May 1 release. The movie has been downloaded more than a million times and Fox News columnist Roger Friedman was fired for reviewing the unfinished version.

"The FBI are on to it and they're taking it very, very seriously," Jackman said. "Rest assured that person will be found."

Despite the piracy, the Aussie, who previewed 20 minutes of the film at the Sydney event, remains confident fans will see Wolverine when it opens, The Associated Press reports.