Description:The Voice is pulling out all the stops and is adding a high-powered rocker to its roster. Green Day frontman Billie Joe Armstrong has joined the show as a mentor for Christina Aguilera's team. NBC confirmed the news Thursday and Billie Joe issued a statement, saying he and his family are fans of the show and The Voice has won over viewers because, "it's not molding artists, it's just giving them a little bit of guidance and direction without giving them a complete makeover."(0:57)