"If we are the No. 1 movie in America, I will do a Calvin Klein underwear campaign," Kutcher, 27, tells TV's "Access Hollywood." (The actor's resume includes a stint on the catwalk for the designer.) "It's actually a bet that I made with my producing partner."
At Monday's premiere of the movie in New York, Kutcher was wearing Calvin Klein – his suit (with silver tie), at least. He told Fashion Wire Daily while on the red carpet: "Long before I was a model, I was a farm kid from Iowa. I know about not being able to dress just as much as I know about being able to dress."
Of the nude scene he has in the romantic comedy, which also stars Amanda Peet, Kutcher told Access: "I like being nude. So for me, it wasn't incredibly tough."