Madonna has met with high-powered British divorce attorney Fiona Shackleton, The Times of London reports.

(Shackleton represented Paul McCartney in his split from Heather Mills. He ended up paying Mills only $48.6 million of the $160 million sought by Mills.)

One lawyer told The Times that Madonna, 49, had met with Shackleton after approaching another firm. (Guy Ritchie, 39, had been rumored “to have had dealings with a lesser-known Mayfair law firm, Forsters,” according to The Times.)

When contacted by Usmagazine.com, her rep said: “No comment at this time, darling.”

It is believed that the couple (who wed in 2000) did not have a prenup, according to The Times. (Madonna is worth an estimated $600 million.)

Breakup rumors have rocked the couple for years.

In the May issue of U.K. Elle, Madonna denied martial strife.

“I had to marry a challenge because otherwise I would just get bored,” she said. “Whatever else Guy is, he’s never boring … We’re both there to help each other and challenge each other.”

She added that she dedicated the love song “Incredible” (on her latest disc Hard Candy) to him.

“Sex with Guy is incredible,” she confessed. “And surprise, surprise, it’s his favorite song on the album. Actually, maybe it’s not his favorite song, but it’s definitely his favorite line.”

They have two children together: Rocco Ritchie, 7, and David Banda, 21 months, whom they adopted in Malawi in 2006. The adoption was finalized last month.

Madonna has a daughter, Lourdes, 11, from a previous relationship with fitness instructor Carlos Leon.

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