It's a big day for Oprah Winfrey.  She unveils a huge surprise on today's show.  She'll announce  on "The Oprah Winfrey Show" that she has a half-sister. The woman has been identified only as Patricia.  Insiders say Patricia has known she was related to Oprah since 2007,  but Oprah has been skeptical.  Patricia has tried to reach Winfrey several times, but never took her story to the media or gone public with her story.  The woman tells Oprah that she thought it was very important that she talk to Winfrey herself and not let someone else tell her.

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