Heather Mills has been warned to pay £2 million in unpaid legal bills or face a court battle.
The former model, who is currently embroiled in a bitter divorce with Sir Paul McCartney, had arranged to hand over the huge fee once her divorce settlement was finalized.
However, law firm Mishcon de Reya no longer represents Heather and the company is now concerned about her paying the bill.

A source said: "Heather has been told she has to make steps to clear the debt. She has been told that a writ is as good as on its way. Mishcon de Reya worked tirelessly in difficult circumstances for Heather and it is now concerned it may not get its money. Mishcon is concerned Heather could get a nominal settlement of a few million pounds and because she has other debts to clear, Mishcon is worried they will be at the back of the queue."