An announcement from Kensington Palace today confirmed that the couple will invite 2,640 members of the general public to Windsor Castle to watch the bride, groom, and their wedding guests arrive at St. George's Chapel-get your hats and fascinators at the ready!
Their life journey then begins as they travel in a royal carriage through Windsor at 13:00 GMT, watched as Prince Harry and Meghan depart by the lucky members of the public and guests on the grounds.
The couple have also asked the Queen's representatives around the United Kingdom to pick 1,200 people "who have served their communities" to join them on their wedding day.
The couple's guests from their wedding ceremony will enjoy a reception at St. George's Hall, Windsor on the afternoon of May 19 2018.
The wedding will be one of the biggest royal events in Britain for some years and is expected to attract thousands of people from across the world lining the route of the wedding procession as it makes its way through the streets of Windsor.
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The final group are people who work for the Royal Households and the Crown Estate, a group which includes people who work for Harry, the Queen and other royals, or more broadly for assets and institutions they're involved with.
ReutersPrince Harry and Meghan Markle in the Sunken Garden at Kensington Palace announcing their engagement.
At around 800, the capacity at St George's Chapel is much smaller.
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The Archbishop of Canterbury Justin Welby will marry the couple and the Rt Rev David Conner, Dean of Windsor, will conduct the service at the Castle's 15th century chapel. His father and mother, Prince Charles and Princess Diana, were married in 1981 at St. Paul's Cathedral, while his older brother, Prince William, Wednesday Kate Middleton in 2011 at Westminster Abbey.
In the evening, Prince Charles will host a private reception for the couple and their close friends and family.