AND THEN THERE WERE THREE: Rob Thomas will mentor Cee Lo Green’s team on season three of The Voice this fall. "I'm really excited to work with Cee Lo and love the idea that I may be in the room with a future superstar that the world has yet to discover," the Matchbox Twenty frontman told Us Weekly. NBC previously announced that Mary J. Blige would work with Adam Levine’s team while Michael Buble would mentor Blake Shelton’s group of contestants. That leaves Christina Aguilera as the loan coach still without an assistant. (7/26a)