The bride, showcasing her newly coloured auburn hair wrapped in a loose chignon bun, oozed confidence in her dramatic gown as she was happily posed for photographers, accompanied by her father Prince Andrew on the steps of St George's Chapel.
In an interview with British Vogue earlier this year, Eugenie said she is "anti-plastic" and aims for the wedding to be plastic-free. The ceremony will be followed by a private reception hosted by the Queen, an evening party hosted by the Duke and Duchess of York and a reported second day of "festival-themed" celebration at Royal Lodge, Prince Andrew's home within Windsor Castle's grounds.
The couple got engaged in January when Brooksbank, 32, proposed during a holiday trip to Nicaragua in Central America.
Italian tenor Andrea Boticelli is to perform during the ceremony, alongside musicians from the Royal Philarmonic Orchestra.
Eugenie's elder sister, Princess Beatrice, the maid of honor, will deliver a reading, an extract from the novel "The Great Gatsby".
The Archbishop of York wrote a personal prayer for the service but it's the Dean of Windsor who will officiate Eugenie and Jack exchanging vows.
Maud Windsor, who is Eugenie's goddaughter and the daughter of Lord Frederick Windsor and his actress wife Sophie Winkleman, is also a bridesmaid.
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Many of these areas seeing the downpour of rain could also see life-threatening flash floods, the hurricane center said. The NHC says that maximum sustained winds have increased to near 75 miles per hour with higher gusts.
Their six-year-old daughter Theodora is one of the bridesmaids.
Fashion queen Kate Moss, wearing a delicate monochrome polka dot outfit, took her seat in the front row as supermodel Naomi Campbell and Cara Delevingne, the face of Burberry, arrived.
Jack works as a drinks executive for Casamigos tequila, which was founded by Clooney and Crawford's husband Rande Gerber.
Just one month after Prince Harry and Meghan Markle revealed their engagement, Princess Eugenie has announced she too will soon be walking down the aisle. There were also crowds of well-wishers on the streets outside the imposing castle.
Newspapers have spent weeks complaining about taxpayers having to foot the 2 million pound ($2.6 million, 2.3 million euro) security bill.
But Eugenie, who is not a working royal, and Jack will not head up the Long Walk like Harry and Meghan, but take a shorter route back to the castle.
As the royal "fab four" arrived at St George's Chapel in Windsor, the Duke and Duchess of Sussex skirted around royal tradition by getting out of their auto first and entering the chapel ahead of the Duke and Duchess of Cambridge.