Derek Hough and his fiancée Hayley Erbert shared ... Derek sported a full beard and walked with their dog next to him. Hayley, 28, wore a grey ribbed sweater with a high collar, black sweatpants ...

Derek Hough put a ring on it! The Dancing with the Stars alum announced the happy news on Instagram Thursday that he was engaged to girlfriend Hayley Erbert after seven years of dating.