King Charles, relatives and leaders express support for Princess Kate after cancer diagnosis

Catherine, the Princess of Wales, announced on Friday that she has been diagnosed with cancer, which was discovered following an abdominal surgery in January. In a video message, she said she was undergoing preventative chemotherapy and said the diagnosis was a huge shock. 

Family, politicians and other high profile figures began sharing messages of support for the princess, who is 42 years old and shares three children with Prince William, the heir to the throne.

In a statement from Buckingham Palace, King Charles said he was proud of his daughter-in-law "for her courage in speaking as she did," the Associated Press reported.