Armstrong joins Christina Aguilera

Green Day frontman Billie Joe Armstrong is set to help Christina Aguilera pick a winner on the new season of hit US TV talent show The Voice.

The rocker joins Matchbox 20's Rob Thomas, who will mentor acts with judge Cee Lo Green, Mary J Blige, who is helping Adam Levine's team, and Michael Buble, who will assist Blake Shelton.

Armstrong began filming his first scenes for the show on Wednesday, and a post on the show's Twitter page has confirmed the news: "Welcome Billie Joe to Team Xtina! We are ready to rock out in Season 3."

The musician admits he is a fan of the competition, in which judges choose acts to work with based on their vocal talents alone during 'blind' auditions.

"It's not moulding artists, it's just giving them a little bit of guidance and direction without giving them a complete makeover," he says.

The new season of The Voice begins in the US on September 10.