Stars who gained lost weight for roles Stars who gained lost weight for roles. Celebrities are known for dropping the pounds. Some have tried crazy diets; others have even gone on TV shows to get their figures back. But a few have packed on the pounds or lost ridiculous amounts of weight in the name of their art. From 50 Cent to Robert De Niro, check out a few celebrity shape shifters. 50 Cent Jaws dropped when pics surfaced of formerly 214-pound 50 Cent looking gaunt. The rapper was known for his buff bod. To play a cancer patient in "Things Fall Apart," how much did the rapper-actor lose? He reportedly transformed in nine weeks by doing this. See which other movies 50 has starred in or has in the works. Will Smith After bulking up for "Ali", the usually 205-pound Smith altered his workout regimen to get a "more sunken-in look" to star in 2009's "Seven Pounds." He lost more than the film's title -- how much? Chec...