Kate Middleton announces she has cancer, undergoing chemotherapy treatment

Princess Kate announced she's been diagnosed with cancer in a video message.

The Princess of Wales, 42, has been undergoing preventative chemotherapy treatment after a planned abdominal surgery showed "cancer had been present." Kate did not elaborate on the form or extent of the cancer in her video.

She gave the update on her health Friday after undergoing major surgery earlier this year.

King Charles III said he is "so proud of Catherine for her courage in speaking as she did," according to a statement released by Buckingham Palace. He has kept in the "closest contact with his beloved daughter-in-law" during this time.