She was the most famous woman in the world. Her marriages (there were eight), affairs, jewelry and medical disasters were all exhaustively chronicled by the tabloids and paparazzi. But away from the klieg lights, a different side of Elizabeth Taylor — witty, wounded, desperate to prove herself — was shared with the tight circle of confidants who surrounded her during her tumultuous life.

And it’s one that Nanette Burstein , director of the new HBO documentary “ Elizabeth Taylor: The Lost Tapes ,” was able to highlight after the Taylor Estate contacted her and allowed her to sort through 40 hours of unreleased audio from interviews the screen legend conducted in the 1960s with journalist Richard Meryman. “It’s extremely rare to have a legendary movie star be so candid about their inner life,” Burstein says. “It was an opportunity to not only understand this revered person in cinema history, but also to chart the arc of the women’s movement and the way that female roles started to shift in the 1950s and ’60s.

” Taylor came up through the studio system, first breaking hearts as the 12-year-old jockey in “National Velvet,” then growing into more adult roles as wives and debutantes in films like “Conspirator” and “Father of the Bride” while still a teen. Burstein’s film includes promotional material for a 16-year-old Taylor that all but salivates over her looks. It’s an ad campaign that hasn’t aged well.

“She was being discussed as a sexp.