One day at a time ... then the Oprah show

Mackenzie Phillips is the guest on "The Oprah Winfrey Show" this Wednesday, and the teaser (above) promises that she -- child star, former drug addict, daughter of rock royalty -- will be revealing an "explosive," 31-year-old family secret.

Big surprise: She's also hawking a book that's published tomorrow, High on Arrival.

What do you think the secret will be?


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