Cher opens up about her marriage to Sonny Bono in her new memoir, 'Cher: The Memoir, Part One.' She reveals that she'd just suffered a third miscarriage when she caught Bono cheating with his secretary.

Cher alleged in her new memoir that she caught ex-husband Sonny Bono cheating on her with his secretary around 1967, when she was suffering from her third miscarriage.

“Cher: The Memoir, Part One” is here – and proving the pop icon is more than "strong enough" to talk about her past. Even when that past involves talking about some uncomfortable topics, including the age gap between her and late ex-husband Sonny Bono.

Though Cher and Sonny Bono’s marriage lasted less than a decade, their musical hits endured. Yet Cher details in her new memoir that the success of her creative partnership with her late husband wasn’t equally shared.

I figured I’d plead insanity … Then I’d get a book deal and my own show,” Cher alleges Sonny told her after admitting to thinking about killing her.

Cher didn't officially divorce Bono until 1975, but the two officially separated in 1974, after Cher had commenced a two-year relationship with record producer David Geffen. She married rock star Gregg Allman only four days after finalizing her divorce with Bono.