The Princess of Wales is celebrating her birthday (PA) The Princess of Wales is celebrating her 41st birthday just one day before the Duke of Sussex’s controversial memoir hits shelves. Kate, whose birthday is January 9, will likely mark the day in a private family way amid a period of fracture and turmoil for the royal family. A flood of inflammatory claims have emerged from Harry’s tell-all autobiography Spare, which was leaked and also put on sale early in Spain ahead of its official release on Tuesday. But it is not the first time Kate’s birthday has fallen in the...