Kate, Britain's Princess of Wales, said on Friday she was undergoing preventative chemotherapy after tests taken after she had major abdominal surgery in January revealed that cancer had been present.
King Charles revealed in February that he, too, was to have treatment for cancer, meaning he has had to postpone his public royal duties.
Hanbury’s husband David, the Marquess of Cholmondeley, is the grandson of Sybil Sassoon — a member of the influential Baghdadi Jewish family.
Kensington Palace said the photo had been taken by her husband, heir to the throne Prince William, last week.
Prince Harry wrote in his new memoir that Prince William and Kate "howled with laughter" when they saw what he was wearing to the party in 2005.