The Duchess of Cambridge, Kate Middleton, turns 39 on Jan. 9, and as the coronavirus rages on, it’s likely she’ll have a low-key day spent with her husband, Prince William, and their three kids: Prince George, 7, Princess Charlotte, 5, and Prince Louis, 2.As Prince William’s wife, Kate always has a lot of royal duties to attend to, but she’s also a very hands-on mom who loves spending time with her children.