Queen Elizabeth II joined the ceremony alongside Prince Harry and his fiancee Meghan Markle in London today. L-R: Burgess Abernethy as Prince William, Laura Mitchell as Duchess Kate, Parisa Fitz-Henley as Meghan Markle and Murray Fraser as Prince Harry.
One well-wisher spoke to Ms Markle about her upcoming wedding to which she admitted she is "very, very excited".
Commonwealth Day celebrates the Commonwealth of Nations, a group of 53 countries around the world that are former British territories.
Meghan is set to marry Prince Harry in Windsor on 19 May.
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The Dean of Westminster, the reverend Dr John Hall, conducted the service and spoke about the uniting the Commonwealth for the future.
Last week, The Queen released her Commonwealth message where she spoke of how the Commonwealth will "work more collaboratively towards a common future".
The Express website has interviewed the expert on the royal family, Richard Fitzwilliams, and it is clear: according to him, at this point, Kate Middleton and Meghan Markle "do not know each other really well".
She may be American, but Meghan Markle knows the British national anthem!
The training was created to expose Markle to a realistic situation and teach her how to respond and protect herself, and live ammunition was used in the training to show her how real gunfire sounds, the Express reported.
Chris Jackson/Getty Images Meghan Markle attends the Christmas Day service at the Church of St. Mary Magdalene on December 25, 2017 in King's Lynn, England.