On May 15 , 2008 , a spokesperson for Mercury Nashville announced that Twain and Lange were separating after Lange allegedly had an affair with Twain 's best friend , Marie-Anne Thiébaud .
On May 15 , 2008 , a spokesperson for Mercury Nashville said that Twain and Lange were separating . This was after Lange allegedly had an affair with Twain 's best friend , Marie-Anne Thiébaud .