50 Cent is to shock fans with a dramatic change to his muscular physique - the rapper is losing a staggering 65 pounds for his forthcoming movie "Things Fall Apart."

The hitmaker co-wrote the screenplay about a college football player suffering from cancer, and he has signed a deal to bring the project to the big screen through his Cheetah Vision Films.

And in order to accurately portray the role, the chiseled star is shrinking his bulging biceps and downsizing his diet.

Co-producer Randall Emmett tells Variety, "Fifty is in the process of losing 65 pounds for the role."

"Things Fall Apart" is scheduled to begin shooting in Michigan in May after the rapper completes his latest tour.

The film is the latest in a string of movie deals for the rapper - he made his cinematic debut in semi-autobiographical 2005 movie Get Rich or Die Tryin' and also starred in 2008's Righteous Kill alongside Robert De Niro and Al Pacino. Fifty also wrote the script for 2009 crime drama "Before I Self Destruct," to tie in with his album of the same name.

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