Shania Twain's longtime personal assistant denies she had an affair with the country crooner’s hubby of 14 years and caused the couple’s split, People reports. "You cannot believe everything you read in the press," said Marie-Anne Thiébaud, 37, of the reports that she and music producer Robert "Mutt" Lange, 59, are ditching their spouses for each other. Twain, 42, remains mum on the subject. (More celebrity divorce stories.)