On Thursday, TMZ reported that Britney Spears angrily walked off the X Factor set after a contestant butchered her song, "Hold It Against Me." This led to much speculation over Spears’ reliability as a new judge on Simon Cowell’s American Idol clone, but in a video message to TMZ today, both Cowell and Spears–who tells Harvey Levin to "Play nice"–deny any strife.

Meanwhile, TMZ is out with another report detailing the unprecedented terms Spears was able to negotiate before signing on to judge the talent competition, including, apparently, the right to walk off set whenever she feels like it.

More details:

"X Factor" wanted Britney so desperately, she was able to negotiate terms that are "unheard of" — so say people with direct knowledge of her deal. As one source put it, "Simon is a smart and shrewd businessman who knew Britney could make his show and he was willing to give her just about anything to come on board — and he did."

So, will Spears be worth the headache that comes from working with her? I guess we’ll find out this fall.