But what about other royal guests?
As such, Markle's wedding day is the first day she will be able to wear a tiara, and so of course, royal watchers are already speculating about which tiara she will select.
While the prince is not shy of a pants and sport jacket combo, since Meghan entered his life, Harry's style has become noticeably more tailored and his overall appearance much more crisp. Mulroney is a famed bridal stylist in Canada, so she is an expert on wedding dresses.
"President Trump will not be invited because the wedding will be for friends and family only", the source stated. This flowing navy lace dress from the Spring/Summer 2018 collection of one of Kate's favourite designers, Temperley London, would be ideal teamed with elegant court shoes and a signature headpiece.
Jessica Mulroney helped Meghan Markle choose her engagement announcement outfit.
But at least "it was a Welsh-make designer of the jeans so at least there was some sort of nod to where she was, so a tick for that". So it's no wonder people are speculating about what she'll wear on the big day-accessories included.
Ralph & Russo is clearly a favourite of the future bride, and she will no doubt have been interested to see the brand's latest designs showcased on Monday as part of Paris Fashion Week. This fuschia midi dress from Temperley London's Spring/Summer 2018 offering would look stunning.
Offering a starting salary of £22,000, the royal household says they're looking for someone who's enthusiastic, knows a good bit about current affairs, has a good energy about them, and possesses a decent set of writing skills.
Harry and Meghan's bridal party could prove quite the Mulroney family affair, with Jessica tipped to be one of Meghan's bridesmaids.
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Middleton had better get used to Markle being popular with the paparazzi.