The ex-Spice Girl and Lorraine Gilles, pictured on a break in Ibiza and at a cosy family meal, have not spoken for months.
It follows divorce paper claims that Mel’s husband, Stephen Belafonte , got Lorraine pregnant, paid for an abortion and engaged in threesomes.
Now they have been invited to thrash out a deal on a libel case filed by the German nanny to stop it going to trial.
A legal source said: “Both Mel and Lorraine are invited to attend. If they do not reach agreement, it could mean many of Mel’s star friends being called on camera video and quizzing by lawyers, before the potential of being called to the stand.”