The beefy rapper, 34, went on a liquid diet for nine weeks to play an American football hero fighting cancer.
The In Da Club star also spent three hours a day on a treadmill to get from 15st 4lbs to 11st 2lbs for Things Fall Apart.
New Yorker “Fiddy” – real name Curtis Jackson – posted photos on his Twitter page, saying he was “starving”.
The singer turned actor – who starts a US tour tonight – has promised worried fans he will regain his physique once filming is over.
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