Today, they are becoming husband and wife at St George's Chapel, Windsor.
Eugenie's sister, Princess Beatrice, served as maid of honor _ she read a selection from F. Scott Fitzgerald's "The Great Gatsby" during the service. Some wondered whether this is the first time a woman has worn a suit to a royal wedding. "If she walked past me right now, I wouldn't even know".
Some of the 850 guests included supermodel Naomi Campbell, singer James Blunt and actresses Liv Tyler and Demi Moore.
The dress features a fitted off-the-shoulder bodice with low back and full skirt draping beautifully into a flowing full length train behind her. She has said previously it's important for people to show their scars.
The duchess wore a hat by Noel Stewart.
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There were occasional blue skies on a generally cloudy, gusty day as the royal standard flew atop the Windsor Castle complex, indicating the queen was in residence.
Eugenie, 28, works at a contemporary art gallery.
And while all were dressed in their finest for the occasion - and Prince George and Princess Charlotte were on their best behaviour - there was one very senior royal absent on the big day; future queen, Camilla Parker Bowles. There was no sign of 5-month-old Prince Louis, William and Kate's youngest child.
Eugenie and Jack announced on Friday morning they have chosen British fashion photographer Alex Bramall to take their wedding pictures, after he previously shot Eugenie for Harper's Bazaar magazine.
Afterward, the newlyweds plan a carriage ride through the streets of Windsor to give the public a chance to see them up close.
The Queen will then host a reception for the couple and their guests at the castle.
Seven-year-old Sienna from London - who wanted Eugenie's dress to be pink with puffy sleeves - missed the event in May because she was in a ballet.
Princess Eugenie and Jack Brooksbank will be heading off on honeymoon as is traditional for all married couples.