Bradley Cooper's 'Hustle' Against Hair Loss! Actor Has 'Turned to Propecia' To Battle Baldness

Bradley Cooper rocked a hilarious perm for American Hustle, but in real life, RadarOnline.com has learned, his hair situation is no laughing matter.

According to a source, Cooper "is so anxious about his receding hairline that he's turned to balding remedy Propecia."

Cooper, 39, "has a lot of bald guys in his family, so he's been on Propecia for a couple of years," the source claims. "And to his delight, it seems to be working."

In fact, Cooper's curly Hustle do was entirely extension-free! But it was still a three-hour ordeal.

"We curled the hair one day with curlers," Cooper told The Los Angeles Times about his time on set.  "We put 110 curlers in and then I sat underneath a heat lamp for 45 minutes on each side."

But the source claims that when he made The Hangover 3 he and the other two male leads, Zack Galifianakis and Ed Helms "had their own dedicated hairstylists, a first for the franchise and something that was demanded by Bradley" because of his sensitivity regarding his hairline.