Exclusive: Behind-the-Scenes of Kellan Lutz's Calvin Klein ShootCourtesy of Calvin Klein

The Twilight Saga‘s Kellan Lutz makes his steamy debut modelling for Calvin Klein’s new X underwear line, and we got an exclusive behind-the-scenes look at the actor’s photo shoot! Fashion photographer Mikael Jansson shot Lutz along with actor Mehcad Brooks, Spanish tennis star Fernando Verdasco and Japanese soccer player Hedetoshi Nakata in Calvin Klein’s first underwear campaign featuring four men. The ads launch on March 1.