On 29 January 1941 at St. Paul's Roman Catholic Church, Haywards Heath to Captain (later Major) Hamilton Joseph Keyes O'Malley (after an engagement formally announced in The Times 18 January 1941) born 18 October 1910, in Farnborough House (Army Barracks) in Aldershot, Farnborough, Hampshire 'Chief of the Name' of the Irish Guards, educated Downside, eldest son of Lt Col Middleton Joseph O'Malley (later O'Malley-Keyes, son of Middleton Joseph Moore O'Malley, Justice of the Peace) and of Jane Byrnes O'Malley, formerly Malley, only daughter of Businessman Edward Malley of New Haven in Connecticut (married 19 October 1909 in New York), of Ross House, Westport, in Connaught and of Castille Meretmont in Biarritz in France. Commanding Officer Giles Vandeleur attended the wedding (as best-man and Army comrade of Hamilton O'Malley). They divorced in July 1946 and Lady Iris formerly reverted to her maiden name of Mountbatten by Deed poll dated 7 January 1949.