Pop superstar Britney Spears had what is being described as a panic attack on her first day of production for Fox’s “The X Factor” and tried to get out of her $15 million job, TMZ.com reports.

The story cites Simon Cowell saying Spears, who was hired as one of the show’s judges, tried to quit the show — and staffers for the show "half-lied" when they told the media that Spears left the set because she had to use the bathroom.

"No one is going to admit that on the first day your highest-paid star after 20 minutes has walked off set," Cowell told the website. He added that Spears "had a moment on the first day where she said to me, ‘I’m not sure I can do this.’"

Cowell said he talked her back onto the show and that she’s now loving her role — and has become a solid judge.

The report adds: “Cowell also blasted his rivals at ‘The Voice’ … claiming ‘Voice’ honcho Mark Burnett was full of crap when he told TMZ he had no idea NBC moved his show to Wednesday night, where it will go head-to-head with ‘X Factor.’"