The singer, whose worth is estimated at $590 million, is said to be seeking advice from Shackelton about a rumored split from her husband, director Guy Ritchie.

A spokesman for the singer refused to comment on the matter, but a lawyer not connected with the case told The Times rumors in the legal community say Madonna went to Shackelton after approaching another firm and Ritchie has been seeking legal counsel of his own.

Speculation about the health of the couple’s relationship first surfaced earlier this month. The pair, who many believe do not have a prenuptial agreement, were married at a high profile ceremony in December of 2000 at Skibo Castle in Scotland.