Kitty Kelley, the queen of gossipy and unflattering (but extremely best-selling) celebrity biographies, has a new subject that isn't gonna like it: Oprah Winfrey.

The author's publisher announced Thursday that her 544-page unauthorized 'Oprah: A Biography' will be released April 13, with a huge first printing of 500,000 copies. We've got a hunch Oprah won't be adding this biography to her book club.