No matter how cool we think we are, every one of us has a silly pop culture obsession that we don't always talk about in public. Well, Green Day singer Billie Joe Armstrong is coming out of the guilty pleasure closet. He loves "The Voice" and he doesn't care who knows it!

Armstrong announced on Thursday that he's proudly joining Christina Aguilera's team as a mentor for the reality singing competition's [article id="1685005"]upcoming fall season[/article]. The eyeliner-loving rocker said he and his family are big fans of the show and in a statement he said he thinks it 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."

The unexpected move by the onetime snot-nosed punk who started out in the gritty clubs of Oakland's East Bay and who has made a name for himself with a series of recent concept albums about political chicanery, love, war and religious intolerance was revealed on Thursday night on the show's official Twitter feed. The announcement linked to a photo taken on Wednesday of Armstrong leaning in toward a smiling Aguilera on the program's set.

Armstrong, who said working with the diva is "a lot of fun," started taping the show on Wednesday. "The Voice" will launch its first fall season on September 10. Given the career boost the show has provided by judge Adam Levine and his band Maroon 5, the move is a savvy one for Armstrong, whose trio is releasing a [article id="1689928"]trio of albums[/article]
 over the next five months, starting with [article id="1687435"]Uno![/article]
 on September 25.

As the celebrity wow factor on reality singing shows keeps escalating with the addition of [article id="1690397"]Mariah Carey[/article]
 to "American Idol" as well as Britney Spears and Demi Lovato to "X Factor," the already star-studded "Voice" is leading the arms race. The show, whose panel is rounded out by Blake Shelton and Cee Lo Green, has announced that the upcoming season's other mentors will include [article id="1690436"]Rob Thomas[/article]
, Mary J. Blige and Michael Bublé.

The latest group of "Voice" mentors joins a list that has previously boasted such bold namers as Kelly Clarkson, Alanis Morissette, Miranda Lambert and Robin Thicke.