British actress Carey Mulligan has fuelled reports she is engaged to marry Mumford & Sons singer MARCUS Mumford after showing off a new diamond sparkler on her ring finger. The An Education star was snapped flashing the dazzling gem while at Sydney Airport in Australia on Monday (26Sep11), two months after reports emerged suggesting the couple was set to wed. Neither the actress nor Mumford, who were former pen-pals, have spoken about the engagement.