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PRINCE CHARLES & CAMILLA
The father of the groom (in his Royal Navy Number One Dress ceremonial suit) leads the way for his wife, the Duchess of Cornwall, who wears Anna Valentine for her stepson's big day.
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QUEEN ELIZABETH II
Her Royal Majesty, in Angela Kelly, wears the happiest of colors – yellow! – for her grandson's nuptials as she greets the Very Reverend John R. Hall, Dean of Westminster, outside of Westminster Abbey.
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"We're quite a reserved lot, we British, [but] when we go for it, we really go for it," the British Prime Minister told the BBC of the pageantry of the royal wedding as he enters Westminster Abbey.
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The groom's uncle (brother of Princess Diana) chats with fellow wedding guests at Westminster Abbey.
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KING CONSTANTINE & QUEEN ANNE-MARIE
Greeting throngs of onlookers outside the Abbey, Greece's former king and his wife add their royal presence to the regal nuptials.
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QUEEN SOFIA, PRINCE FELIPE & PRINCESS LETIZIA
After attending Queen Elizabeth's dinner, Spain's monarchy turns up for the royal nuptials, with the Prince and Princess of Asturias attending alongside Felipe's regal mother, Queen Sofia.
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ZARA PHILLIPS & MIKE TINDALL
Princess Anne's daughter rounds out her royal entrance in Paul Costelloe and a circular topper by Philip Treacy as she makes her way into the nuptials with her rugby player fiancé.
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The mother of the bride – in powder blue Catherine Walker, a favorite designer of the late Princess Diana – glowingly greets well-wishers after spending the night with her daughter at London's Goring Hotel.
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PRINCESSES EUGENIE & BEATRICE
The groom's cousins, daughters of Prince Andrew and Fergie, arrive to the wedding in top form – check out those fascinators by Philip Treacy!
See more of the wedding's best hats here!
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PRINCE ALBERT & CHARLENE WITTSTOCK
The Prince of Monaco and his fiancée (in Akris), a former South African swimmer, make a coordinated match in gray.
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The singer, who performed at Princess Diana's memorial concert in 2007, makes her red-hot entrance into the wedding in London.
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Kate's younger brother leaves the Goring Hotel, where the Middleton family spent the night along with the bride-to-be before her big day.
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The legendary singer and his partner David Furnish leave their baby boy at home as they stylishly make their way to Westminster Abbey.
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LADIES KITTY, ELIZA & AMELIA SPENCER
William and Harry's first cousins and daughters of Charles, Earl of Spencer – (from left) twins Amelia and Eliza and big sister Kitty – find their seats before the royal nuptials.
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BEN & MARINA FOGLE
The TV presenter (who's often been mistaken for the groom) leads the way for his expectant wife into Westminster Abbey.
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The daughter of Prince Charles's close friend and skiing pal Charles Palmer-Tomkinson dons a head-to-toe blue ensemble as she heads to Westminster Abbey.
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The Australian Olympic swimmer (aka "Thorpedo") ditches his Speedo for a dapper morning coat while making his way into the royal nuptials.