The 26-year-old singer/songwriter received his title for services to music and charity by Prince Charles, Harry's father, at a service at Buckingham Palace in London.
When asked if he'd like to sing for the 33-year-old prince and the former 'Suits' actress at their ceremony at Windsor Chapel in May, 2018 - he said: ''Yeah, why not.''
The 'Perfect' hitmaker said the 69-year-old royal was amazed that he was jetting off to New York immediately after to play a concert, and jokingly asked if he's still making lots of money from his record sales.
Ed laughed: ''He was asking me if I was still selling lots of records and I told him I've got a concert in New York tomorrow, and he was quite surprised I was flying after this.''
The musician was no doubt overcome with emotion as on this day a year ago he sadly lost his grandfather, and he hopes he would have been ''pretty proud'' of his achievement, seeing as he was a huge fan of the royal family.
After the ceremony, he said: ''My grandfather was a massive royalist.
''He had all the commemorative plates and stuff, and he died on this day four years ago, so it's actually quite a nice full circle thing, I guess he'd be pretty proud.''
Despite breaking numerous records - including becoming the most-streamed artist on Spotify, and topping the Apple Music and iTunes charts with the most popular album, 'Divide', and song ['Shape of You'] of 2017 - and winning countless awards during his career spanning more than a decade, Ed said that ''persistence'' has got him where he is.
The 'Thinking Out Loud' star downplayed his success and said only ''30 per cent'' of it is down to his talents as a musician and songwriter.
He admitted: ''I think it's persistence. I don't have a vast amount of talent compared to other people, I think talent is like 30 per cent of it and persistence, drive and self belief are the other ones, which I guess are all the same thing.''
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