Hail Mary! Employees of Oprah call her “Ms. Winfrey” when they’re on the set in Chicago, but outside, she’s known by the code name “Mary.”

PHOTOS: OPRAH THROUGH THE YEARS

“That way, when they’re talking about her, and someone overhears the conversation, no one knows they’re referring to Oprah,” the talk-show queen’s biographer, Kitty Kelley, told Montecito Journal columnist Richard Mineards. Kelley, who did four years of research and 850 interviews, claimed in the book that Oprah had “lesbian affairs” and once had a fling with former TV host John Tesh.