"If we are the No. 1 movie in America, I will do a Calvin Klein underwear campaign," Kutcher told Access Hollywood.
"It’s actually a bet that I made with my producing partner, so we will see what happens," he added. Kutcher was previously a model for Calvin Klein and Versace before his film career.
A Lot Like Love has Kutcher in the lead role, and also stars Amanda Peet. The film opens on Friday, April 22.