When Bradley Cooper met President Obama earlier this year at the White House State Dinner, he was missing an important of his outfit -- underwear.

Bradley caught up with Ellen yesterday and explained that he went commando because he's gained weight for a new movie role and his pants were too tight. "I wore the tuxedo I wore to the Golden Globes. I just sort of threw it in the bag and brought it and went to Washington, D.C., and then I'm getting dressed like 10 minutes before I was supposed to go, and literally the pants go up to like here. So I had to go commando, number-one, because there was no room at all... It was a nightmare, but I made it through."