Cheryl Fernandez-Versini and Mel B are reported to have had a furious bust-up following the X Factor results show on Sunday.
The singer was heard calling out her fellow judge on the ITV show after Mel decided to send Cheryl's act Lauren Platt home, and despite her being saved by public votes, Cheryl is still said to be furious.
A source explained to The Sun newspaper: "Over the years there have been a lot of rumours of spats between the judges.
"Some have been serious, others have been blown out of proportion.
"But what happened between Cheryl and Mel B on Sunday night was real.
"In Cheryl's opinion, Mel completely went back on everything she has been saying all series about Lauren and Stereo Kicks.
"Cheryl was livid hat Mel turned on her act and the fact she called her out in front of millions shows just how angry she was."
However it is said that the former Spice Girl was "more than capable" of holding her own once the cameras stopped rolling.
"Mel and Cheryl got on really well at the start of the series, but it will take a while before they are back on good terms."
Tagged in Cheryl Tweedy Louis Walsh Mel B