The 16-year-old singing hopeful is reportedly a 'nightmare' to work with over the top diva demands who causes conflict behind-the-scenes.
A source told Reveal magazine: "Tamera is a great singer with good looks, but boy, does she know it.
"She’s over the top demanding and causes conflict behind the scenes wherever she goes: With stylists, producers and other contestants.
"I’ve worked with people like Tamera on the show before, so I know that if she’s like this at an early stage then she’s going to be a nightmare later on."
But Tamera - who has been at the centre of press reports about her bullying, shoplifting past - has hit back at the negative headlines.
She told Heat magazine: “I don’t think I’m any different from any other teenage girl, to be honest.
“Yeah, I have made mistakes in the past, but who hasn’t? It was a long time ago and I’ve really moved on from it.”
Meanwhile, another 'X Factor' source played down the stories that Tamera is a diva, telling Tellymix: “This story is totally wide off the mark – Tamera is always friendly and laid back in studio and production staff have even commented how impressed they are with her attitude and behaviour.”