The couple are to Wednesday at Windsor Castle on May 19, it was announced on Friday afternoon. The palace revealed that Markle has met them on many occasions.
"Wishing Meghan and Prince Harry a lifetime of love, laughter and happiness together", she wrote.
Officials had already revealed that Prince Harry would Wednesday American actress Meghan in May 2018, but a new post on Twitter has announced the actual day that the ceremony will take place. They'll tie the knot at St. George's chapel at Windsor Castle in front of Queen Elizabeth, Prince William, Kate Middleton and the rest of the royals.
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Prince Harry and Markle have been dating since mid 2016, and made their first public appearance as a couple about a year ago.
Kensington Palace said in a tweet: "His Royal Highness Prince Henry of Wales and Ms. Meghan Markle will marry on 19th May 2018".
The wedding will take place roughly one month after the Duke and Duchess of Cambridge are expected to welcome their third child to the family.
Prince William will nearly certainly be in attendance but will have to sacrifice his attendance at the FA Cup Final, one of the biggest events in English football.