It's 1972, the year of Watergate, The Godfather and Exile on Main Street. On a suburban Maryland lawn, a young Anna-lou Leibovitz peers into her Nikon as members of her family scramble into place. As they pose, an ever-present Super 8 camera captures the scene. Although Leibovitz is a Rolling Stone magazine photographer, this event - her first turn as the official family photographer - is as important to her as any arena concert or movie shoot.

Flash forward 34 years to 2006. This time, the now-famous photographer is on the other side of the lens. And this time, her younger sister Barbara is pointing the camera, documenting the life and times of Annie Leibovitz for American Masters.

"Through the decades, Annie Leibovitz has chronicled our cultural history. Her museum-quality portraits transcend celebrity photography," says Susan Lacy, creator and executive producer of American Masters. "We go behind the scenes and on location with an artist who is as famous as her subjects, where we see first-hand the incredible passion she brings to every assignment. And we're privileged to see a more personal dimension of Annie Leibovitz - the sister, the daughter and the mother of three."

Given unrestricted access, director Barbara Leibovitz spent a year documenting Annie Leibovitz at home and at work. "As her sister, I feel a serious responsibility not only to tell her story - but to tell it honestly," says Barbara Leibovitz, a writer, director and producer of award-winning documentaries. "It was a challenge, but I learned more about my sister than I ever imagined."

Barbara and Annie Leibovitz spent years talking about collaborating on a film, but waited until both felt the time was right. In December 2004, Annie Leibovitz's long time friend, writer and critic Susan Sontag, died of cancer. Six weeks later, her father died. As part of the grieving process, Leibovitz pored through and cried over decades of photographs. Last summer, when she began selecting images for her latest book, her sister began filming the creative process.

Wednesday, 1/3/07 from 9:30-11 p.m. ET