‘American Sniper’ Cast Bradley Cooper 40 Pound Weight Gain Necessary? ‘Hangover’ Star Transforms To Play Navy Seal

"American Sniper" cast Bradley Cooper gained 40 pounds in order to give justice to his new role and give honor to a fallen soldier. While the "Hangover" star is not afraid to be silly in front of the camera, he's transforming himself to play a Navy Seal.

According to Eric Close, who is part of the film "American Sniper" with Bradley Cooper, the "American Hustle" actor is very dedicated to his workout regimen in order to gain 40 pounds.

"He's really been working hard. He looks great. He's really taken on this character," Eric Close told E! News. "He really takes this story personally and wants to do an honorable job for Chris' memory and for his family."

In a series of photographs published on JustJared.com, the transformation of "American Sniper" cast Bradley Cooper was very clear as he wore a very tight shirt showing off his huge chest. He was also sporting a scruffy beard, which makes him look all the more tough.

Bradley Cooper was just stepping out of Tom Ford store on Thursday when he was photographed by the paparazzi. According to the website, "American Sniper" cast Bradley Cooper might have picked a Tom Ford suit since he will be one of the co-chairs of the 2014 Met Ball on Monday night which.

Apart from "American Sniper" cast Bradley Cooper, the film has a stellar cast and legendary director. Helmed by Clint Eastwood, the film also stars Sienna Miller, Luke Grimes, Kyle Gallner, Jake McDorman, Sam Jaeger, Brian Hallisay, and Marnette Patterson.

"American Sniper" is a biopic about a former Navy Seal, the late Chris Kyle, who called himself "the most lethal sniper in U.S. Military history" with 160 confirmed kills.

As he wrote in his book, "after the first kill, the others come easy ... I look through the scope, get my target in the cross hairs, and kill my enemy, before he kills one of my people."