The pair sealed their union with two shy kisses on the West Steps of St George's Chapel on Friday, before celebrating at an afternoon reception in Windsor Castle and an evening do at the York family home Royal Lodge in Windsor Great Park.
The decision came as a surprise, given the trend of brides changing into a second dress at recent royal weddings.
Prince Andrew opted not to make a speech at the wedding ceremony, but he watched on lovingly as Princess Eugenie exchanged her vows with her now-husband Jack Brooksbank.
Queen Elizabeth II and her husband Prince Philip attended the wedding, along with Prince Charles, Prince William, Prince Harry and other senior royals.
ASSOCIATED PRESS Britain's Princess Beatrice, right, and her mother, Sarah Ferguson, left, battle the gusty winds up the stairs to the chapel.
On Friday, the princess tied the knot with her longtime boyfriend, Jack Brooksbank, in St. George's Chapel at Windsor Castle.
Eugenie's wedding dress featured a unique neckline that folded around the shoulders to a low back and draped into a flowing full length train.
She and Andrew certainly appeared to be "such a unit together", at their beloved Eugenie's wedding.
Queen Elizabeth's granddaughter Princess Eugenie married wine merchant Jack Brooksbank at Windsor Castle today in front of celebrities and Britain's senior royals including Prince Harry and wife Meghan who Wednesday at the same venue in May.
Meghan, wearing a navy blue outfit by her bridal designer Givenchy, was seen staring deep into Harry's eyes as they sat in their seats.
After the service, the couple took a horse-drawn carriage tour of Windsor before a reception at the castle hosted by the queen.
Eugenie, 28, works in art while Brooksbank is European Brand Manager for Casamigos Tequila, which was co-founded by actor George Clooney.
Security around Windsor was tight, with airport-style security checks and large numbers of police.
Another, asking for bids of £200, said it was a "very rare collectors item for those who love the British Royal Family and British Royal Weddings".