The Princess of Wales is celebrating her 43rd birthday today, and her children have found a special way to celebrate her. The mum-of-three is set to spend the day at the Windsor family home, Adelaide Cottage, with Prince William by her side. And while the couple's three children will have to attend school as usual, they will likely present their mum with a very special gift upon their return. Prince George , 11, Princess Charlotte , nine, and Prince Louis , six, are said to follow a sweet