But one of The Queen's former protection officer has revealed that even she is occasionally able to slip under the radar.
Richard Griffin described how Her Majesty had gone for a walk near the grounds of Balmoral dressed in tweeds and a headscarf.
So low key was her look, that a group of American tourists completely failed to realise who she was.
Mr Griffin, who was speaking at a recent talk about his time working with the royals, said the Queen was keen not to blow her cover, according to The Times.
She played along when the American tourists asked: 'Do you live round here,' simply replying that she had a house nearby.
And when asked if she had met the Queen, she simply gestured to her companion and said: 'No, but he has,' according to the policeman.
The Queen was completely unrecognisable to the tourists, who would have been more used to seeing the monarch in a bright array of colourful suits and hats.
Who do you think it is...