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Cher is suing Sonny Bono's widow Mary for allegedly illegally withholding royalties from Sonny & Cher tracks.
The singer filed the lawsuit in Los Angeles federal court on Wednesday, asking for $1 million in damages.
According to reports, Cher and Sonny agreed to split the revenue from the songs they'd recorded as a duo - including I Got You Babe and The Beat Goes On - following their split in 1975.
However, Cher claims that Mary - Sonny's fourth wife - "has undone" her ownership of the rights and royalties, although she didn't indicate exactly how that has happened.
Mary has yet to comment on the lawsuit.
Sonny & Cher enjoyed huge success as a duo in the 1960s with their music and TV show The Sonny & Cher Comedy Hour. Following their split, they pursued different interests, with Cher forging a movie career and releasing countless solo hits as Sonny moved into politics.
He died in 1998 in a skiing accident.
