Showbiz
Rex Features
According to Holy Moly, the singer is starting divorce proceedings against her husband Guy Ritchie.
Mostyn's previous high-profile cases include Heather Mills, Earl Spencer and footballer Ray Parlour.
The singer apparently met the legal representative at his London office ten days ago.
It is rumoured that Ritchie and Madonna don't have a prenuptial agreement, meaning the film director may be entitled to some of the popstar's fortune.
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