Marrying into the royal family must be incredibly daunting with all the expectations, responsibility and endless rules to abide by.
The then Kate Middleton had a lot to learn in the run up to her 2011 wedding to Prince William as she didn't come from a royal or high society background.
But luckily the Queen was there to teach her everything she knows, reports MyLondon.
According to the 2017 Amazon Prime documentary, Kate Middleton: Working Class to Windsor, Kate took private lessons on “how to be a royal wife” before the big day - and who better to learn how to be a royal from than the head of the family herself.
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The meetings between the two reportedly happened ahead of Kate's wedding.
During this time, the Queen also helped Kate decide what her official royal title could be, eventually settling on Catherine, Her Royal Highness The Duchess of Cambridge.
"From the beginning, Kate Middleton had a great deal of support from the Royal Family which was really instructed by the Queen," Journalist Ashley Pearson explained in the documentary.
"This was to make sure she knew as much as she could possibly know and what to do in every situation – bearing in mind, of course, that she didn’t grow up in this world."
As for what Kate's secret 'Princess lessons' involved, Ashley revealed the one thing that she really needed to work on was how to 'preserve her modesty.'
Ashley continued: "There were things like learning how to get out of a carriage without exposing your modesty and learning how to bend down to get flowers from a young girl without exposing your modesty.
"Things that you would never think you’d have to learn but, of course, a woman in her position would certainly need to know.
"There were all kinds of small details and little bits of etiquette – how to sit, who to curtsy to, who not to curtsy to, what fork to use and whatever else they felt she needed to know. She was actually given lessons on how to be a royal wife."
Kate's mother-in-law Camilla, Duchess of Cornwall, also has some words of wisdom on how to 'hang on to a prince.'
But according to royal author Robert Lacey, she struggled to follow it.
Camilla's essential tip for Kate was to make sure her life moulded to the way William leads his, in order to make the union last.
In his royal biography, Battle of Brothers, Robert said: "Camilla had confided to Kate the secret of hanging on to a busy prince: fit your timetable - well, basically your whole life - around his."
However, despite Camilla's advice, Lacey claims that this wasn't really possible for Kate as William's diary was "un-fit-roundable".
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