Princess Eugenie and Mr Brooksbank first met during a skiing holiday when she was 20 years old and he was 24.
Buckingham Palace announced the news in a statement on Friday morning, sharing that the couple will be welcoming their newest addition in "early 2021".
The Duchess of York has delighted fans by reading a book about a magical grandmother on her YouTube series - just hours after her daughter Princess Eugenie announced she is pregnant with her first child.
Another royal baby is on the way!
Sarah included a similar photo to the one Eugenie and Jack shared in their announcement.
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The pair tied the knot back in October 2018, surrounded by loved ones at St George's Chapel at Windsor Castle.
As you can see from the announcement, details are now fairly sparse about the exact due date of the next royal baby; all we know at the moment is that we'll be welcoming him or her into the world "early" next year.
As Princess Eugenie's child will be born down a female line of the royal family, he or she will be just Master or Miss Brooksbank, with no royal title.
They dated for around seven years before he proposed.
The duchess previously spoke of her hopes of becoming a grandmother, saying she would be "excellent" in the role.
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