Heather Mills did nothing to endear herself to the organizers of the Miss USA pageant over the weekend, according to a report.

Sir Paul McCartney’s ex -  who was on the judging panel - apparently got on the wrong side of the show’s producers with her unreasonable demands and her "enormous ego."

Bosses reportedly threatened to drop Heather when she "flat-out refused" to sign a deal allowing the show to be broadcast worldwide.

A source told The Mirror: "She wants to get paid if they resell the footage. Her ego is enormous."

Organisers have now vowed never to work with her again, it's claimed.

"She treated this like she was starring in a big-budget movie," added the source.

Heather is threatening to make the U.S her adoptive home – despite being greeted by a chorus of boos when she was introduced at the event.