NEW PHOTO: Seeing Double! Which Is The Real Jon Heder?

Who knew Napolean Dynamite star Jon Heder had a twin brother.. who's identical!

Jon stepped out with his brother Dan at the world premiere of the new Star Trek movie Thursday night in Los Angeles.

Jon once stated during an appearance on Late Show with David Letterman that he and Dan, think alike and, as children, would often finish each other's sentences. When Letterman asked him whether being an identical twin is a good experience, Dan replied that it is mostly good, but that as children "we caused a lot trouble by pretending to be the other, the memories still give me a good chuckle."