Christine Brown is opening up about an "absolutely devastating" battle she's been waging behind closed doors - a battle with drug addiction. The Sister Wives star has officially released her new book, Sister Wife: A Memoir of Faith, Family, and Finding Freedom - and with it, a dark and deeply personal secret: just before her step-daughter Maddie got married, she became addicted to Oxycodone after undergoing knee surgery: "Just before Maddie and Caleb [Brush] got married [in 2016], I blew out my knee. I tore my ACL and my meniscus, and I had to have surgery.