Sources: Husband's Alleged Affair Caused Shania's Split

May 20, 2008 - What caused the sudden breakup of Shania Twain and her husband, music producer Robert "Mutt" Lange, after 14 years of marriage? His relationship with another woman, say several sources. Reached by PEOPLE after the separation was announced in a statement, Lange called the split "an unfortunate thing." - 0 Comments