Duchess Kate's British Vogue cover. (Photo: Vogue) London - The British edition of Vogue will mark its 100th anniversary with a rare portrait of Kate Middleton looking relaxed in the countryside. The Duchess of Cambridge opts for a casual look in her first-ever cover shoot for Vogue. The fashion magazine is publishing a series of Middleton images shot by photographer Josh Olins in its June edition and some will be placed in Britain's National Portrait Gallery.