Everyone's heard the dubious rumors over the years about how the wholesome hippie-era TV show "The Brady Bunch" was actually a debauched quagmire of sex, drugs and despair. Now student council president and the prettiest Brady, Marcia, is here to say — it's all true!

As Marcia Brady, Maureen McCormick projected an image of the smart, near-perfect, girl next door. But off camera, she was anything but. And yes, she did sleep with Greg (Barry Williams).

Now 52, McCormick writes about her struggles in a new memoir, "Here's the Story: Surviving Marcia Brady and Finding My True Voice," hitting stores today. She discusses her romance with Williams, her dates with Michael Jackson and Steve Martin, cocaine binges and parties at the Playboy Mansion and the home of Sammy Davis Jr., an unwanted pregnancy and trading sex for drugs.

McCormick was 14 when "The Brady Bunch" debuted on ABC, running from 1969 to 1974. Despite her role as a sunny Miss Perfect, she struggled privately with anxiety and insecurity.

When "The Brady Bunch" ended, she took up a hard-partying lifestyle in Hollywood, using drugs including cocaine and Quaaludes. She struggled to regain her earlier success, landing some TV and movie roles, but developed a reputation for unreliability due to her addiction, even botching an interview with Steven Spielberg because she was high.