Washington, Apr 28 : Matthew McConaughey is set to trade his lean muscular frame for a fat belly for a new movie in which he is playing an overweight fighter.

The Hollywood heartthrob, who is regularly snapped topless on the beach or working out semi-nude near his California home, has earned a strong female following owing to his toned body.

However, now ‘The Wedding Planner’ actor has revealed he''s swapping muscles for flab for new film ‘The Grackle’.

But, the 39-year-old actor is already prepared for the inevitable paparazzi shots of him looking out of shape.

"When I go to do The Grackle and put on 20 pounds, they''re going to go, ''What happened?''" Contactmusic quoted him as saying.

Talking of his character in the film, he said: "It''s set on Bourbon Street, New Orleans, and he''s down there eating it all and drinking it all and smoking it all."

However, McConaughey has confessed that he''s looking forward to letting it all go.

"I''ll eat more cheeseburgers. That''s my favourite food. Man who invented the hamburger was smart; man who invented the cheeseburger was a genius,” he said. (ANI)