Jessie J and Sir Tom Jones complained about the judges on rival reality shows not being able to sing and perform properly.
Sir Tom said: "It is disappointing when you see a judge and they are a performer and they can’t even sing."
In a not so secret dig, the Welsh star moaned: “I can’t mention any names. But sometimes they get up and do a thing and I think ‘How the hell are you going to get up and do a thing in front of these people, let alone coach?’
“I’ve seen that and I disagree with it.
“That makes our show more credible because we are not TV personalities. We are all performers.”
Speaking at the launch of the second series of The Voice UK earlier this month, Jessie J agreed.
“I always say you wouldn’t go to a plumber to learn how to drive,” she told members of the press. “I can teach someone how to sing a song because that’s what I do.
“I shouldn’t be afraid to be good at it.
“I think it’s disappointing when you see these people doing these jobs on TV and they aren’t credible. I think it’s misleading.”
The Voice UK starts Saturday, March 30 on BBC One.
Browse pictures of The Voice UK 2013 coaches and hosts below...