Heather Mills made a throat-slashing gesture at Sir Paul McCartney's lawyer

Heather Mills made a throat-slashing gesture at Sir Paul McCartney’s lawyer Fiona Shackleton, it has been claimed.

Heather, 40, reportedly made the gesture shortly after the divorce ruling that exposed her as a scheming fantasist and left her with a $48.6million settlement -- just a fifth of what she wanted.

Mills -- dubbed Lady Mucca due to her sordid past -- had read Mr Justice Bennett's damning judgment and realized that Shackleton's courtroom success had left her reputation in tatters.

Sir Paul told pals that he was stunned by Heather's gesture towards Fiona -- the divorce lawyer also famed for dealing with Prince Charles' divorce from Princess Diana in 1996.

A source said: "Paul thought Heather had gone completely off her rocker. He was shocked because it was so completely out of order and just not the way to conduct yourself in court."

After making the gesture, Mucca, 40, then poured a jug of water over Ms Shackleton’s head.

The $1000-an-hour lawyer, one of Britain’s top divorce experts, was seen entering court with an immaculate hairdo – and leaving with a slicked-back wet look.

The source added to British newspaper The Sun: "Heather obviously blames Fiona for the payout and the way her image has been ruined."