Mötley Crüe Nikki Sixx got behind the camera to shoot a sexy, glam rock-inspired feature in Alexa, The Post’s fashion magazine in the newspaper on Wednesday. The rocker, radio host and co-designer of fashion label Royal Underground was enthusiastic about his Post project. He recently dropped hints about it via Facebook, wearing a T-shirt emblazoned with, “Headless Body in Topless Bar,” referring to the famous 1983 Post headline. “People are realizing that I’m not really a one-trick pony,” Sixx said. “I don’t just make music. I’m an author, I do photography, part of a clothing line, I have a radio show. I’m in two different bands with very different music. I’m a father, I’m a recovering drug addict, so all these things I like to expose . . . It’s really awesome for the audience to go, ‘Wow, I didn’t know he was a photographer,’ and then they start looking into photography and the messages, and they go, ‘It actually makes sense with what he was saying on his earlier albums . . . It’s a theme of recovery.’ ”