Chris Hemsworth stripped down for a nude scene that the star says has been a long time coming.The 38-year-old Australian superstar walked the red carpet at the world premiere of in Hollywood on Thursday, and he spoke with ET's Cassie Di Laura about the revealing new Marvel blockbuster.The actor's chat was hilariously crashed by the film's director, Taika Waititi, who briefly took over interviewing duties to ask «What is it about Taika that is, like, very special, and that made you wanna come back again?»«Obviously a contractual obligation,» Hemsworth quipped. «If it was my choice it wouldn't have happened.»When the pair were asked about the nude scene, Hemsworth joked, «Oh yeah, you took my pants off didn't you?»«In the movie! In the movie,» the actor quickly clarified.«He didn't even know we were shooting,» Waititi deadpanned.