McFly's Danny Jones thinks Katherine Jenkins is a 'touchy-feely' teacher.
The Welsh opera diva is currently training Danny for 'Popstar to Operastar', and the 'Obviously' singer has taken to twitter to discuss Katherine's approach.
He said: "The teacher is touching me up."
Katherine, however, responded to the claims and said she has to get close to those she is teaching.
The 29-year-old opera star said: "It is quite a physical thing we do. We do a lot of stuff with breathing and so I have to put my hands on the singers.
"But it's not like what Danny says on twitter. It wasn't like that. Honestly!"
Meanwhile, presenter Myleene Klass has hit out at critics of the show.
The 31-year-old - a former student of the Royal Academy of Music - said those who dislike the reality show are "archaic".
She told The Sun newspaper: "Criticising the show makes them feel a little bit important. But this archaic and prehistoric attitude is so boring.
"It shows how out of touch they are. It is such an obvious and easy route to take and I think a lot of it is to do with their age.
"If they are trying to protect a genre of music and keep it for a certain type of person, it just shows how antiquated their thinking is."
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