According to royal author Robert Jobson, Zara Tindall "can tell the heir to the throne he is being pompous" and she apparently does! Their closeness and her straight-forward approach seems to be why Prince William is happy to take her comments on the chin. They used to get up to mischief as children and the professional equestrian was the reason Prince William once got told off by Queen Elizabeth. Meanwhile, royal expert and author Ingrid Seward previously shared her belief that Zara is the "sister William never had". She understands what royal life is like, but she can live her life as she chooses, without the pressure faced by more senior royals," Ingrid added.