While her wedding gowns received an overall "yes" from royal watchers (and more than the odd fair-weathered monarchist), the Duchess of Sussex's first turn as wedding guest since joining the royal family has divided opinions.
Harry and Meghan will present the winning trophy for the 4.20pm race, the St James's Palace Stakes, stated the programme.
Meghan arrived by carriage with Sophie, Countess of Wessex, and Prince Edward, Earl of Wessex.
Men must wear "black or grey morning dress which must include: A waistcoat and tie (no cravats); A black or grey top hat; Black shoes worn with socks".
The Royal Ascot is one of the most sought-after events for horseracing enthusiasts and fashionistas alike. "The visit is at the request of Her Majesty's Government", the tweet read.
However, she will be eager to avoid looking like a copycat of the Duchess of Cambridge or seeming to compete with her late mother-in-law Princess Diana.
Meghan donned a stylish monochrome outfit, designed by Givenchy and completed her outfit with a Philip Treacy hat.
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Meghan can carry a floral white dress at a royal engagement and look elegantly royal in at buttoned-down dress at a horse race event.
Catherine stunned for her first appearance at Royal Ascot, in 2016, in an ivory lace Dolce&Gabbana dress which she paired with a cream headpiece by Jane Taylor.
"I am not a big fan of the royals, but I think Meghan is lovely and Harry is his own person", Ms White said. Is it possible she wanted to give Meghan the opportunity to be the star of the show?
"It was very much her dress, and I felt very proud that she came to me for that part of the wedding".
Despite this, Meghan, Harry, and Queen Elizabeth were all smiles at the event on Tuesday.
Just a month before she exchanged vows with Harry, Meghan joined the royal to attend the Commonwealth Youth Forum in London, and wore a button-down white pinstripe dress by Altuzarra that we can not get enough of.