The gloves are off and the claws are out in the reality singing show wars!

Singer John Legend, who will unite with Kelly Clarkson on the newly launching ABC show 'Duets' (which will pair established, A-list judges with upstart contestants), took a shot at new 'X Factor' judges Britney Spears and Demi Lovato. He said that they can't sing, making their appointments to the show's panel questionable.

"You know it's interesting. It should be very interesting. I don't have much to say," Legend stated to E! "It's interesting when people you know who are judging singing competitions when they aren't really singers. It's interesting."

Zing! Tell us how you really feel, John!

For her part, Clarkson, who won 'American Idol' during its maiden season, was excited that the ladies-who-can't-sing-according-to-John-Legend are boarding the show. "I'm excited for both of them. I'm a big fan of both of them. Both of those girls are super sweet," she said. Aw! It's all love emanating from Clarkson.

She continued, "I think it's fun for them, too, to just be more out in the public eye again. I think those two are two you really want to root for and you really want them to succeed, so I think that's exciting."

Clarkson also addressed the mutually beneficial and symbiotic relationship between the new judges and the show, and the fact that 'X Factor' underperformed in Season 1. She pointed out that Spears and Lovato would give it the star power it desperately needs, saying, "I think that show really needs it. I don't think everybody latched onto that show like they thought they would."

Let's see how 'Duets' and 'X Factor' fare...

Watch John Legend + Kelly Clarkson Talk to E!