When Prince Harry told his most trusted advisors his plans to propose to Meghan Markle, he was quickly informed of the royals rules he had to follow. Top of the long list was asking the Queen for permission.
In his memoir Spare, Harry expresses his annoyance at having to ask for his grandmother, claiming it "didn't make any sense" as he was a grown man.
And his unhappiness with the demand was clear in his wording when he finally found a moment to speak to his Granny, and it didn't go unnoticed.
In fact, the Queen's short reply was of a very similar tone and left Harry speechless.
Harry admits he was nervous about asking the question, understanding that a 'no' from the head of the family would cause chaos in his relationship with Meghan.
He decided to wait until the family were on a shooting trip in Sandringham, hoping it would put the Queen in a "good mood".
Once the shoot was finished Harry managed to get the Queen alone, admitting his mind was racing.
He recalls his exact words in Spare, telling his grandmother how much he loved Meg and that he wanted to marry her. He said he then asked: "I've been told that I have to ask your permission before I can propose".
The Queen then replied: "You have to?" to which Harry replied that is what he had been told.
There was a moment of silence before the Queen replied: "Well then, I suppose I have to say yes."
Harry admits he was completely thrown by her answer. He writes: "I didn't get it. Was she being sarcastic? Ironic? Deliberately cryptic? Was she indulging in a bit of wordplay? I'd never known Granny to do any wordplay and this would be a surpassingly bizarre moment (not to mention widely inconvenient) for her to start, but maybe she just saw the chance to play off my unfortunate use of the world "have" and couldn't resist"
He claims he stood there trying to work out what she was saying, but then "realised" she was saying yes, describing himself as a "muppet".
He then thanked her, saying it was "fabulous".
Once he had the go-ahead from the Queen, it came to designing the ring and planning the perfect moment. He took two diamonds from Princess Diana's collections and one from his beloved Botswana to create the gold ring.
He popped the question during a night in at their Kensington Palace home. The couple roasted a chicken then headed outside with candles to sit under the stars.
But Harry almost gave the game away with his choice of drinks for the casual weekday dinner.
Speaking of his proposal in their Netflix show Harry & Meghan, the prince explained: "I did pop a bottle of champagne while she was roasting a chicken and that kind of slightly gave the game away.
"She was like, 'You never drink champagne, what's the occasion?' And I was like, 'I don't know, I just had it like, lying around"
While he set things up, Meghan called a friend to share the excitement. She recorded the phone call, and can he heard saying: "Oh my God Jess, Jess, it's happening, it's happening. He told me not to peek."
The couple shared a romantic photo of the moment on the docuseries, showing Harry kneeling on a blanket holding a ring box in one hand and Guy's collar in the other while a bunch of white roses sat on the floor in front of him.
Recalling the moment in their engagement interview, Harry said: "She didn't even let me finish. She said, "Can I say yes? Can I say yes?" and then there were were hugs and I had the ring in my hand and I was like, "Can I - can I give you the ring?"
"She goes, "Oh yes the ring." So no it was - it was a really nice moment, it was just the two of us and I think managed to catch - catch her by surprise as well."
Have you read Spare yet? Let us know what you thought in the comment section below.
