Looks like Bow Wow is all grown up. The 21-year-old rapper-turned-actor – now known by his real name, Shad Moss – just shot his first sex scene for HBO’s Entourage. “It’s with a porn star,” he told PEOPLE Wednesday night during the N.Y.C. premiere of the show’s fifth season. “It was unreal because I didn’t know that I had a sex scene until that day.