Cheryl Cole & Dannii Minogue at War!
Well, in the autobiography stakes, as their books hit shops on the same day...
An insider toldNicole Scherzingerwaiting in the wings to step in if they don't sort out their differences."
"Dannii and Cheryl don't really speak outside of the show - but Simon wants them to behave like best friends. You can imagine how they reacted to that!"
They added: "But Simon's reached a point where he doesn't need the stress. His view is that if the girls give him a headache during filming, he'll just bring in Nicole.
"He's made it clear that she'd love to get a look-in, but that's the last thing Dannii and Cheryl want, so it's essentially Simon's way or the highway."