The X Factor judges Tulisa Contostavlos and Louis Walsh have had a massive bust-up with Kelly Rowland.

According to reports, they are unhappy that Kelly keeps giving them unsolicited advice on how to mentor their acts.

"Producers are likening the studios to a disaster zone,” a show insider told the Sunday Mirror. “The acts are getting the blame for the show not going so well, so they're a bit downtrodden - like the walking wounded. Meanwhile, the judges are sniping at each other."

Tulisa in particular was said to have got annoyed when Kelly gave her a handwritten note with her tips on songs for the Rhythmix and The Risk.

"Tulisa could not believe her ears," the source told the tabloid. "She was relaxing with her entourage and Kelly walks in with all these notes. She was dumbstruck. So in a dismissive tone she just said, 'Don't worry about it babe, I'll be fine'.

"Kelly didn't even realise Tulisa was being rude,” they continued. “Kelly only realised both were annoyed when someone mentioned it in the week. She was pissed off.”

Meanwhile, Louis has claimed the Destiny’s Child singer doesn’t understand the UK market. "Kelly is too R&B, she knows that music inside out. But this is The X Factor, not Soul Train. She needs to be more mainstream,” he claimed. “This is a Saturday night show for all the family.

The tension threatened to spill over into Saturday night’s live show, when Dermot O’Leary was forced to [uuid=20e48b02-912c-49d7-b825-000e2d6eeee3]step in to stop the bickering[/uuid] when Tulisa and Louis ganged up to rant about Kelly’s act Misha Bryan.