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Christine Brown Woolley instantly knew when her husband, Kody Brown, found his "soulmate."

The 53-year-old, who chronicled her polygamous marriage in the TLC reality series "Sister Wives," is sharing her story in a new book, "Sister Wife: A Memoir of Faith, Family, and Finding Freedom." It lays bare her strict Mormon upbringing, her decision to walk away from a 25-year marriage and her discovery of love in a monogamous relationship.

Fox News Digital reached out to Kody Brown, 56, for comment.

‘DUCK DYNASTY’ STARS WILLIE AND KORIE ROBERTSON SHARE THE HARD-WON LESSONS OF DECADES-LONG MARRIAGE

"So many women have been asking me, ‘How did you do it? How did you know it was time to leave?’" the mother of six told Fox News Dig

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