Earlier we told you that Oprah will reveal a family secret on Monday's show.
And now it's been revealed by her unauthorized biographer, Kitty Kelley, that Oprah will be reunited with the half-sister that was given up for adoption as a baby.
Kelley says that Oprah's mother, Vernita Lee, gave birth to a daughter named Bunny, whom she "gave away shortly after she was born because she couldn't afford to take care of her."
Bunny, who is now a grandmother, will appear on the Oprah Winfrey show on Monday.
[Image via WENN.]