Maureen McCormick may have played the squeaky-clean Marcia Brady on “The Brady Bunch,” but in real life, the teenage actress’ antics would be too racy even for “Gossip Girl.” In her new memoir, “Here’s the Story,” the former wild child recalls days of trading sex for drugs and partying at the Playboy Mansion.

“There I was, hiding the reality of my life behind the unreal perfection of Marcia Brady,” writes Maureen, now 52. “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.’”