And while the monarch has been vocal about her support of the couple, there's one part of their wedding that she might skip altogether - at least according to royal expert and biographer Katie Nicholl.
Prince Harry and Meghan Markle's post-wedding carriage ride route may be closed to latecomers if the 100,000 revellers expected become a safety issue. "The Military and these units, in particular, hold a great significance for Prince Harry and the couple are incredibly grateful for their support", the statement continued.
Nicholl also reiterated that Queen Elizabeth has a close bond with Prince Harry, adding that Her Majesty could "never say no" to her grandson. "Plan it as you want it.' [This] is very generous because, don't forget, the queen is opening up her home".
According to some estimates, the security operation for the royal wedding could amount to 30 million pounds. On the big day, visitors may be stopped and checked by police officers.
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"The wedding of Prince Harry and Ms Markle is no exception".
Mulroney, her husband Ben and their three kids are reportedly invited to the royal wedding. Over 250 soldiers are going to perform ceremonial duties.
Among the units invited are the Household Cavalry, with members taking on a role inside the royal residence's St. George's Chapel, where Harry and Meghan will exchange vows.
"Marrying these ingredients creates a new pale ale that is young, fresh and full of character", proclaimed Windsor & Eton Brewery, which launched the limited edition craft beer on Wednesday.
British Transport Police will also be patrolling stations and carriages. The other 1,440 people are from the Windsor Castle community, the Royal Households and Crown Estate, local charities and other organizations.