'Entourage' star Adrian Grenier reveals that Eminem's guesting on the HBO show came about in a way that, well, sounds like something straight out of 'Entourage.'

"I actually met Eminem several months ago, interviewing him for a documentary we're making. He mentioned that he loved the show, and I said, 'Do you want to be on it?' And he said, 'Yeah.' So I called Doug [Ellin, the show's creator] right then," Grenier recounts to PopEater. "I said, 'Doug, how would you like Eminem to be on the show?' He said, 'I'd love it!'"

"Well, watch what you ask for. We don't even get to be buds. Doug wrote this whole thing -- I can't mention what it is, but Eminem and Vince have a conflict," Grenier says with a laugh, referring to his movie star character on the show. "It's very interesting, you have no idea."