Filming on the fourth Die Hard movie has apparently had to be put on hold while Bruce Willis gets back into shape.

Willis has admitted that he may have put on quite a bit of weight since playing John McLane in the 1988 original, 18 years ago. He said that he had no desire to embarrass himself with a 'flabby physique' on screen.

He said: "I need to get in shape, I need to work out.

"There is a high chance it will be out next summer - we're in the final stages of getting it all together."

The movie's plot had to be rewritten after last year's Hurricane Katrina tragedy - the original screenplay involved an oil tanker explosion that sends huge waves flooding into New Orleans, Louisiana.