Marcia Brady's Tell All Book

Maureen McCormick tells all in her new memoir, Here's the Story: Surviving Marcia Brady and Finding My True Voice. In the book she reveals intimate details about her secret life of binging on cocaine, trading sex for drugs and dating her TV sibling.

In addition to discussing an unusual string of relationships with Steve Martin, Michael Jackson and her TV brother Barry Williams, the actress and sometime country singer also reveals that she once traded sex for drugs and engaged in full-on binges at the Playboy Mansion and at the home of Sammy Davis Jr.

She discusses her relationship with Barry Williams, who played Greg Brady. The affair intensified while the The Brady Bunch filmed episodes in Hawaii.

"We couldn't hold back any longer," she writes in the book published by William Morrow. "It was our first kiss, and it was long, passionate and deep. It was wonderful, too, though as we continued to kiss and press against each other so closely that we could feel each other's body heat, a part of me — a tiny part, admittedly — said to myself, `Oh my God! I'm kissing my brother. What am I doing?'"

"As a teenager, I had no idea that few people are everything they present to the outside world," McCormick, now 52, writes in the book. "Yet there I was, hiding the reality of my life behind the unreal perfection of Marcia Brady. "No one suspected the fear that gnawed at me even as I lent my voice to the chorus of Bradys singing 'It's a Sunshine Day.' "

McCormick was 14 years old when the family sitcom began its four-year run in 1969 and apparently didn't have much personal experience to draw on for the character. In the book, out today, the actress says she came to the feel-good show from an abusive family, with a father who abused and cheated on her mother. When the show ended, McCormick says she turned to drugs, taking cocaine and Quaaludes among other illicit substances, a habit which failed to help her secure additional employment.

The book hits stores today.

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