Since becoming a royal, Meghan has made some noticeable changes, deleting her social media pages, wearing tights to public engagements, and curtsying to both the Duchess of Cambridge and Queen Elizabeth on the regular.
The Queen and Meghan will conduct a series of engagements in the city together before heading back to London in the evening.
However, that's set to change this weekend as she takes part in the Trooping the Colour celebrations for the first time, where she will make her royal balcony debut.
Meghan Markle and her mom Doria Ragland.
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Prince William married Kate on 29 April 2011, but it wasn't until 1 March 2012 - nearly a year after Kate married into the family - that she attended the Fortnum & Mason store with Her Majesty and without her husband.
In December last year, Meghan had greeted Queen Elizabeth during the Christmas Day church services and in March earlier this year, she had joined the royal family for a church service at Westminster Abbey.
The palace's guidelines add, "Gifts offered by private individuals living in the United Kingdom not personally known to the Member of the Royal Family should be refused where there are concerns about the propriety or motives of the donor or the gift itself". In fact, Harry and Meghan are rumored to be on their honeymoon right now, but no one has actually spotted them. This is in place to protect the family from exploitation.
The duke will travel with his new wife the Duchess of Sussex to Australia in October for the fourth Invictus Games, which will be staged in Sydney.