The couple got engaged in January when Brooksbank, 32, proposed during a holiday trip to Nicaragua in Central America.
From the world of Hollywood were Lord Of The Rings and Armageddon actress Liv Tyler and Ghost star Demi Moore, wearing a dark jacket and long skirt and a burgundy dress and matching fascinator respectively. With an expected security bill of $3.5million, even United Kingdom politician Chris Williamson spoke out recently, labelling it "an outrage".
Ahead of her big day she spoke of the importance of showing "people your scars" as she paid tribute to the hospital which performed surgery on her back as a child.
U.S. working with Turkey, Saudi Arabia on journalist probe: Donald Trump
Saudi officials say the journalist left the consulate after his brief visit, rejecting the Turkish claims as baseless. Mr Trump told reporters he had talked to the Saudi authorities "at the highest level" about Mr Khashoggi .
In an interview for This Morning, Eugenie admitted pre-wedding nerves were "creeping up".
Rounding out the bridal party are six-year-olds Maud Windsor, whose parents are Lord and Lady Frederick Windsor, and Teddy Williams, daughter of singer Robbie Williams and Ayda Field.
Dean of Windsor David Conner will officiate and give an address.
Maid of honour Princess Beatrice - Eugenie's older sister - will read an extract from F Scott Fitzgerald's classic novel The Great Gatsby.
Erdogan: Saudis must prove missing reporter left consulate
Khashoggi, 59, went missing while on a visit to the consulate in Istanbul for paperwork to marry his Turkish fiancée. Khashoggi has not been seen since his fiancee saw him enter the Saudi Arabian consulate in Istanbul on October 2.
A police officer makes security checks around the castle.
Just like Meghan and Harry's nuptials, Eugenie's wedding is taking place in St. George's Chapel at Windsor Castle, but that's not the only similarity.
The couple has invited 1,200 members of the public to come onto the castle grounds for a closer glimpse of proceedings.
After the carriage procession, Eugenie and Jack's wedding guests will go to Windsor Castle for a reception hosted by Eugenie's grandmother, Queen Elizabeth II.
Imf Warns Of 'somewhat' Greater Global Financial Risk
The IMF announced it had reduced its outlook on the global economy to a 3.7% growth rate for this year and next, down 0.2% from what it had originally predicted in July.