Princess Charlotte Elizabeth Diana of Cambridge is the middle child of the Prince and Princess of Wales, and is fourth in line to the throne. Now seven years old, Charlotte was born at 8.34am on 2 May, 2015, at the same hospital as her older brother.
After she was born, King Charles (who was still the Prince of Wales, at the time), said that Princess Charlotte is "beautiful". While she might be younger than George, she's not afraid to tell him to adhere to royal protocol, as was shown when she reminded him to bow at Queen Elizabeth's funeral.