TwainBook230.jpgShania Twain is finally opening up about her ex-husband's affair in a new memoir, aptly titled From This Moment On.

In 2008, Mutt Lange, Twain's hubby of 14 years, left her for her then-best friend, Marie-Anne Thiebaud. In January Twain married Frederic Thiebaud, Marie-Anne's ex, who she was married to when she and Lange had the affair.

Twain reveals that when she found out about the affair she cried constantly, took five baths a day and called her ex-bestie the c-word. She writes:

    "It was kind of cathartic. Harsh, I know, but after all, it is only a word. My emotions were so balled-up inside me that it felt good to release."


    "I'll be honest: when your husband leaves you, and falls into the arms of your close friend, your self esteem can really suffer."


Twain also opens up about her abusive stepfather, who she says sexually and physically abused her. She says she saw him abuse her mother, once holding her head in a toilet bowl. On one occasion, Twain fought back.

    "I ran up behind my dad with a chair in both hands and smashed it across his back. Before I could get away, he punched me in the jaw. Adrenaline pumping, I punched him back!"


Twain finally convinced her mother to escape to a shelter, but they suffered financially. They ate bread and wore the bread bags on their feet as shoes.

Twain has certainly been through the ringer. She appears in her first TV interview in five years today on Oprah, and she's now documenting her new life in a reality show on the OWN network.

The show premieres May 8. See a preview of it after the jump!