In a personal written message released on Friday, Kate said she had been "blown away" by the thousands of kind messages from across the globe which followed her cancer announcement in March.
Even though Kate Middleton, Princess of Wales, isn't Jewish, Jews are allowed to pray for her health as she battles cancer, Rabbi Binyamin Shmueli said.
Is it true that Charles is an unlucky name for a monarch? Here, we take a look at some of the unfortunate holders of that royal moniker.
Princess Kate's cancer revealed in video, palace silent on details. UK medical community speculates on type of cancer.
Following Kensington Palace revealing Middleton's diagnosis, UK Chief Rabbi weighs in, sparking questions about the royal's mysterious Jewish connection.
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.
Kensington Palace said the photo had been taken by her husband, heir to the throne Prince William, last week.
In general, British royals avoided making statements on political issues, but before his father became king, he spoke out on matters close to his heart.
Charles spent three nights in hospital last month where he underwent a corrective procedure for an enlarged prostate.