'The Voice' adds more stars (welcome, Reba!)

The Voice is adding a few more celebrities to its roster. NBC announced today that singers Reba, Monica, Sia (Furler) and music producer Adam Blackstone will join the series as advisers who will lend their experience and talents to Christina Aguilera, Cee Lo Green, Adam Levine and Blake Shelton. The advisers will assist the coaches during the “battles” competition phase.

Aguilera will team up with singer/songwriter Sia, Levine with Maroon 5 Music Director Blackstone, Green with singer Monica, and Shelton with veteran singer Reba. The advisers are supposed to help improve the contestants, though critics of the original series that bowed in Holland say the show loses some of its luster during the battle round. That part occurs in a boxing ring, of sorts: Contestants from each team do a duet within the “ropes” and the weakest one goes home.