Most recently confirming the couple's lemon elderflower cake will be made by Claire Ptak and that self-taught florist Philippa Craddock will be designing the floral decorations filled with roses, peonies and foxgloves.
There is one question, though, that's still on everyone's lips: what will Meghan wear?
The 36-year-old's all-important wedding dress has been subject to much speculation ever since the couple's engagement last year, and with the wedding in Windsor now weeks away, anticipation has reached fever pitch.
So, in case you're struggling to keep up with all the rumours (we know we are), here's a definitive guide to every prediction, hearsay and likelihood about the bridal gown:
Who will design Meghan's Dress?
There are oh-so-many theories about who will be the designer chosen to create Meghan's wedding dress and whoever it is will go down in history...
A British designer?
Many think that, in homage to her new British home, she will choose a British designer.
This would certainly be in keeping with tradition: Princess Diana's wedding dress was designed by David and Elizabeth Emanuel, while the Duchess of Cambridge opted for a more modern gown by Alexander McQueen's creative director Sarah Burton.
Meghan following in her sister-in-law-to-be's footsteps is definitely not out of the question.
In fact, bets on Meghan's dress designer have been suspended after a flurry of activity favouring McQueen unexpectedly took place in February, hinting someone may know something we don't.
Burberry is also a front runner, as fellow designer Henry Holland recently hinted, "I would be quite excited if it was Christopher Bailey’s final bow for Burberry. I think that would be a nice thing for him to do, she’s worn for them for a long time.”
A designer she has worn before?
Another popular prediction is that she is going to wear Ralph & Russo.
The couture brand hit headlines last year when Meghan broke royal protocol by wearing a sheer black chiffon and tulle gown by the luxury label for her official engagement portraits with Prince Harry.
So, with Meghan already a fan, and Ralph & Russo recently becoming the first British brand in over 100 years to debut at Paris Couture Fashion Week, it is surely a possible contender.
Will she add a Canadian twist?
During her official visits with Prince Harry, Meghan has filled her royal wardrobe with independent Canadian brands.
Canada, and Toronto in particular, holds a special place in the actress' heart as it's where she filmed her hit series Suits and lived for several years.
Many think Meghan could make a smart sartorial choice by picking British fashion house Erdem, which is run by Canadian-born designer Erdem Moralıoğlu. The perfect compromise.
It's no secret that the label is a favourite with the royals and, according to fashion industry websites, has just taken its PR in-house.
Could they be preparing for a media storm?
It could be the underdog...
Possible wedding dress designers that have also been mentioned include Elie Saab and J.Mendel, as well as Roland Mouret, Antonio Berardi and Misha Nonoo.
Relatively unknown Israeli brand Inbal Dror is also in the mix after the brand's bridal sketches, submitted to the Palace, were leaked last year, sending social media into a frenzy.
Her dress will cost less than the Duchess of Cambridge's
Whichever designer, whichever style, we can be fairly certain of one thing: that Meghan's dress will cost less than Kate Middleton's.
The Duchess's dress cost an eye-watering £250,000, of which her parents Carole and Michael Middleton footed the bill.
Meghan is expected to wear a dress with a lower price tag.
Why? She is said to be keeping the price to a minimum out of respect for the future Queen Consort, AKA the Duchess of Cambridge.
She may wear Princess Diana's tiara
Much like Diana Spencer and Kate Middleton before her, when the 36-year-old actress becomes part of the British royal family, her bridal look will feature an important accessory: a tiara.
There has been much speculation as to which of the royal household's endless collection of jewels Meghan will wear, the most popular rumour being that she would follow the Duchess of Cambridge's lead wear the Cartier Halo tiara, which was loaned to Catherine and previously belonged to the Queen Mother.
However, it has since been revealed that on the royal wedding day, the famous tiara won't be in the country. It will be on the other side of the world in Australia, on display alongside 300 other dazzling items at 'Cartier: The Exhibition' at the National Gallery of Australia.
So with that theory out window it's back to the drawing board and bets are now on that Meghan will pay tribute to Princess Diana by wearing the Spencer Tiara; the one Diana wore for her wedding to Prince Charles.
The Wedding Ring
Lastly, let's not forget about the other important accessory: the wedding ring.
It is highly likely that Meghan with receive a plain gold band on the day to go nicely with her striking three diamond-strong engagement ring.
Although we can't be certain of the style or hue, it is presumed that the ring will be made out of Welsh gold.
Welsh gold from the Clogau St David’s Mine has been favoured by royalty since 1911 and has remained a royal wedding tradition since 1923, when it was started by Her Majesty The Queen Mother.
Since then, generations of royal brides, including Princess Diana and The Duchess of Cambridge, have worn wedding rings made from the historic nugget.
Interestingly, though, due to the fact that mining has long deceased at St David's, Wales where it is sourced, it is thought that Meghan's could be the last ring made out of the rare and royal gold.