Royal correspondent: Catherine trying to protect the children
The Princess of Wales has said she is in the early stages of treatment after cancer was found in tests.
In a video statement, Catherine said it was a "huge shock" after an "incredibly tough couple of months".
But she sent a positive message, saying: "I am well and getting stronger every day."
Details of the cancer have not been disclosed, but Kensington Palace says it is confident the princess will make a full recovery.
Royal correspondent Daniela Relph has more on today's announcement.