Eye colour Green Measurements (US) 33-24-35 ; (EU) 84-61-89 Dress size (US) 6 ; (EU) 36 Spouse David Lasnet Stella Tennant (born 17 December 1970) is a British model . The granddaughter of Andrew Cavendish, 11th Duke of Devonshire and Deborah Mitford , who is the last of the noted Mitford sisters ,