Oprah Winfrey has secrets -- enough to fill a book apparently. Luckily, author Kitty Kelley is still in the unauthorized biography business, and her latest tome delves deep into the heart of the icon's personal life, examining subjects as touchy as Winfrey's sexuality and the identity of her father.

In 'Oprah: A Biography,' Kelley leaves few rocks unturned in a quest to expose more about Winfrey, who is already known for being pretty open about her life's journey.

Kitty Kelley writes Oprah Winfrey biography