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Oksana Grigorieva is expected to dish about Gibson's tape recorded tirades and alleged physical abuse, as well as charges she tried to extort the "Braveheart" star.
According to an UsMagazine.com source the deal is done, although Winfrey's production company, Harpo, declined to confirm it.
In July, Gibson, 54, came under fire when a series of audio tapes of him screaming at Oksana surfaced. Grigorieva has since been accused of using the audio rants to attempt to extort more than $10 million from him.