The Prince and Princess of Wales celebrate their 13th wedding anniversary on Monday April 29.Kate, who is undergoing chemotherapy for an undisclosed cancer, married future king William in 2011 after eight years of dating.The pair are facing their most difficult challenge so far amid the princess's diagnosis, with Kate appealing for time, space and privacy as she continues her treatment.

The Prince and Princess of Wales celebrate their 13th wedding anniversary on Monday April 29.Kate, who is undergoing chemotherapy for an undisclosed cancer, married future king William in 2011 after eight years of dating.The pair are facing their most difficult challenge so far amid the princess's diagnosis, with Kate appealing for time, space and privacy as she continues her treatment.