Heather Mills has issued an ultimatum to Sir Paul McCartney - agree to a $100 million divorce settlement by tomorrow or fight her in court. Heather, who split from the Beatles legend in May 2006 following a four-year marriage, knows Paul is desperate to avoid an expensive and potentially embarrassing public court hearing and is confident he will pay up before the deadline.

A source told Britain's Daily Mail newspaper: "Heather has demanded that her lawyers contact Paul's legal team to say they have a deadline of tomorrow. If they do not agree to the settlement she will give the green light to slug it out publicly in court."

"Heather has been saying it is not in Paul's best interest to go to court by reminding him of the cards she is holding. A lot could come out in court and she could publicly destroy his reputation."

Last year, leaked court documents alleged Paul had been abusive towards Heather during their marriage. It was claimed Paul once stabbed her in the arm with a broken wine glass and was verbally abusive.

The 39-year-old model is even said to be threatening to take their three-year-old daughter Beatrice to the U.S. for an extended stay in a bid to convince Paul to agree to the sum."

The source added: "Heather has started making worrying noises about the custody of Beatrice, suggesting she might take her to America for long periods of time."

"She has been saying that if this goes to court, she will be awarded more money and it will be awful for Beatrice to have her parents publicly warring. Her legal team are even saying she could fight for future earnings."

Meanwhile, Heather - who lost her left leg below the knee when she was hit by a police motorbike in 1993 - is in "absolute agony" and is set to undergo surgery after a metal plate in her pelvis broke.

A source said: "It separated after a screw came out."

"Two weeks ago the joint moved and is out of line - it's not stable. She could face a serious operation."

Heather - who was in a wheelchair when she arrived at the court last week - could be forced to rest for six months.

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