But what about the groom's side of the family? Here's all you need to know about the lesser-known relatives who'll join the couple at St George's Chapel, Windsor Castle.
Who are Jack Brooksbank's parents?
Jack's father George is a chartered accountant and a company director, according to The Telegraph.
His mother Nicola (née Newton) lives with her husband in a gated period apartment in Wandsworth, London.
Jack has a younger brother named Thomas, who works in business management for a London-based asset management firm.
It's been confirmed that Thomas will act as Jack's best man on his big day.
While his family can't be counted as royalty just yet, Jack is descended from the Brooksbank baronetcy.
Baronet is a rank in the aristocracy, below dukes, marquesses, earls, viscounts and barons.
Interestingly, Jack and Eugenie are distantly related.
Eugenie's mother Sarah, Duchess of York is the great-great-granddaughter of a woman named Lady Julia Coke.
Lady Julia was the daughter of Jack's great-great-grandfather Thomas William Coke, the 2nd Earl of Leicester.
This makes the couple third cousins once removed – just like Eugenie's grandmother Queen Elizabeth II and her husband Prince Philip.
What has his family said ahead of his wedding to Princess Eugenie?
When Eugenie and Jack announced their engagement in January 2018, his parents released a statement reading: "We could not be more delighted with the news of the engagement.
"We are completely over the moon and are very excited for them both."
Shortly after, Jack's grandmother Joanna Newton praised her son's fiancée.
In a candid interview with The Sun, the 91-year-old said of the wedding: "I'm thrilled about it. It's amazing.
"I would never have thought it for a moment that it was going to happen and we are all very happy. I never thought he would get married to a royal.
"He's a charming boy and all that but not the most intelligent and I would never have thought this would happen.
"I just never thought it would go this far her being a member of the Royal Family.
"But Jack has always had lovely manners and has always been a good egg.
"I would call him ordinary, I wouldn't say there is anything special about him, he's a good-looking, nice chap and I think it says a lot about Eugenie that it's him she wants and it's lovely."
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