This X Factor judge’s sly behaviour has Cheryl “furious”!

Viewers watching Sunday night's X Factor results show might not have noticed too much tension between Cheryl Fernandez-Versini and Mel B, but behind the scenes things were really heating up.

Cheryl was reportedly "livid" that Mel chose to save boy band Stereo Kicks over Lauren Platt, an act of Cheryl's who had always been a favourite of Mel's. 

The former Girls Aloud star briefly addressed her annoyance on air, saying, "I find it amazing that the critiques have been a certain way over the last few weeks, then it comes to this part and it changes – that amazes me." 

Mel B was then spotted mouthing "You what?" at her fellow judge, but host Dermot O'Leary moved on before giving the singer a chance to properly respond.

According to an insider, it was after the live show ended that the cat-fighting really began. "Mel is more than capable of standing up for herself and when the cameras stopped rolling, she pulled Cheryl up straight away," a source told The Sun. "That led to a really frosty moment… Cheryl was livid that Mel turned on her act and the fact she called her out in front of millions of people just shows how angry she was."

Despite Mel's attempts to explain her decision to vote for Stereo Kicks, Cheryl apparently refused to sit next to her during The Xtra Factor, filmed after the results show. 

This isn't the first time Cheryl has moved seats following a row with a fellow judge – last month she demanded that Louis swap seats with her on air after coming to blows with Simon over his act Jay James. But it sounds like things could be a little more serious this time. "What happened between Cheryl and Mel B on Sunday was real." said the source.

"In Cheryl's opinion, Mel completely went back on everything she has been saying all series about Lauren and Stereo Kicks."

Wow… we hope they can sort things out before next Saturday!