The '4 Minutes' singer was said to be impressed by Fiona Shackleton's handling of the former Beatle's bitter battle with ex-wife Heather Mills and wants her to represent her case against Guy Ritchie.
A friend of the singer insists Fiona is the natural choice for Madonna, telling Britain's Daily Mirror newspaper: "Madonna always seeks out the best in whatever field she is interested in at any given time. Fiona Shackleton is the best."
Madonna - who reportedly has no pre-nuptial agreement with Guy - had been hoping to resolve their difference but has reportedly realised their relationship is irreparable, she needed a proper legal consultation.
One friend of the lawyer - who also represented Prince Charles in his divorce from Princess Diana - said: "Madonna was impressed by Fiona's work for Sir Paul and the way she handles herself in the public eye. She is a consummate professional."
Earlier this month, Madonna was forced to deny rumours she had been having talks with Nicholas Mostyn QC - the lawyer who represented Heather in her divorce from Paul.
Madonna's spokesperson denied those claims, but of the latest rumours would only say: "We are unable to comment on this."
Madonna, 49, and Guy, 39, have a seven-year-old son Rocco and an adopted son David, two. Madonna also has a daughter, 11-year-old Lourdes, from a previous relationship.
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