To witness them become husband and wife, the couple invited 600 of their nearest and dearest, who have begun arriving at St George Chapel in Windsor for the royal wedding.
And the guest list is something to behold with a glamorous mixture of Hollywood's elite and real-life royalty including Duchess Catherine, Sophie of Wessex, Lady Louise, Prince Charles, Duchess Camilla, Princess Beatrice and Princess Eugenie.
To close friends, dignitaries and a range of high-profile celebrity guests including the Clooneys, the Beckhams, Sir Elton John and Priyanka Chopra!
Here are some photos of famous faces as they arrive to the wedding of the year!
The Hollywood legend looks absolutely flawless in baby pink.
Adhering to the strict hat policy, the 64-year-old shows of her finesse with a touch of feathers.
British singer James Blunt is a good friend of Prince Harry. Both have served in Britain's armed forces.
Princess Diana's siblings Earl Charles Spencer, Lady Sarah McCorquodale and Baroness Jane Fellowes have all been invited to the wedding.
Pippa Middleton, who is expecting her first child, has arrived with her husband James Matthews. Prince George and Princess Charlotte also were in the bridal party for her wedding and will have another starring role in Uncle Harry's wedding.
Is it the Oscars or a wedding?
Human rights lawyer Amal Clooney and hubby George Clooney have swooped into Windsor and it's a real royal flush!
The Duchess of Cambridge's mother Carole Middleton.
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