Sir Ian McKellen has admitted he broke down in tears during filming for The Hobbit in which he reprises his role as wizard Gandalf.
The gay British thespian says he cried shooting scenes for the Lord of the Rings prequel because he was forced to act alone in front of a green scene.
'In order to shoot the dwarves and a large Gandalf, we couldn't be in the same set,' McKellen told Contact Music.
'All I had for company was 13 photographs of the dwarves on top of stands with little lights. Whoever's talking flashes up.
'Pretending you're with 13 other people when you're on your own, it stretches your technical ability to the absolute limits.
'I cried, actually. I cried. Then I said out loud, "This is not why I became an actor". Unfortunately the microphone was on and the whole studio heard.'
The first film in The Hobbit trilogy is scheduled to be released worldwide in December 2012.
Watch the trailer for The Hobbit: An Unexpected Journey below: