Eugenie, 28, younger daughter of the queen's third child, Prince Andrew, and his ex-wife, Sarah Ferguson, the Duchess of York, tied the knot with Brooksbank, 32, in the castle's 15th Century St George's Chapel.
BBC News 24 broadcast footage of the princess walking into St George's Chapel inside Windsor Castle with her father Prince Andrew.
Cara showed up in a top hat and tails to the wedding at St George's chapel in Windsor, where Meghan and Harry were Wednesday earlier this year.
It was the same setting as the wedding of Harry and Meghan earlier in the year, and the Duke and Duchess of Sussex, as the couple are now known, were among the star-studded congregation at Friday's event.
Eugenie, 28, and Jack, 32, announced their engagement in January 2018 after eight years together. It only takes five seconds to see why - she looks positively stunning - but it turns out her attractive wedding day look has even more meaning than we initially thought.
Training course for construction mental health launched Less than one percent of global aid is donated to mental health; even in developed countries, the issue is dismissed. Many more people - one in four, in fact - will have mental health issues at some point in their lives.
No, really. The bride's sister, Princess Beatrice, read a passage from the F. Scott Fitzgerald novel and the Dean of Windsor mentioned it in his homily.
The design was a custom creation by Peter Pilotto and Christopher De Vos - the duo behind Pilotto's namesake label - who made the dress "layer by layer".
Models Kate Moss and Naomi Campbell as well as singer Ellie Goulding were also among the attendees at Windsor Castle, the venue where Eugenie's cousin Prince Harry and Meghan Markle married in May.
Queen Elizabeth II and her husband Prince Philip attended the wedding, along with Prince Charles, Prince William, Prince Harry and other senior royals.
It was reported guests had been asked to "surrender mobile telephones, cameras and any electronic devices used for image capture" for the afternoon reception at Windsor Castle, hosted by the Queen.
You might not have heard, but there's yet another royal wedding taking place.