She’s a natural! Prince William and Duchess Kate’s 5-year-old daughter, Princess Charlotte, is well aware of her princess status.“Charlotte knows she a princess and already has a toy tiara, which she loves wearing,” a source exclusively reveals in the new issue of Us Weekly.The little one’s parents, who also share Prince George, 7, and Prince Louis, 2, “go out of their way to keep the kids grounded,” the insider adds.