Remember when Bradley Cooper attended the White House State Dinner? Well, he wasn't wearing any underwear.

Cooper admitted on 'The Ellen Show' today (Feb. 17) that he went to the prestigious political events sans undergarments because he couldn't fit into his tuxedo.

Basically, Bradley gained 15 pounds in four weeks for a movie role, but still packed the same suit he wore to the Golden Globes and had to get creative when he couldn't fit into it.

At which point in his story he told the cheering audience full of ladies, "So I had to go commando."

Jump to around the 1:04 mark to see how Bradley had to greet people in his incredibly tight tuxedo.

How tight was it you ask? It was "crazytown" tight.