From http://www.musictarget.com

Prince to feature on new No Doubt album

As reported earlier, No Doubts new studio album "Rocksteady" will feature special guest appearances, including one by Prince. Prince plays with No Doubt on the track "Waiting Room." Although No Doubt's new album is said to have a general reggae feel, it also features some dancehall reggae and electro-funk, synth pop and early-80s new wave elements.