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PRINCESS EUGENIE AND PRINCESS BEATRICE
The groom's royal cousins make for a dashing duo in their Philip Treacy hats. Eugenie sets off her bold blue floral Vivienne Westwood suit with an equally electric hat with feathers and flowers, while Beatrice accents her red locks with a sculptural blush topper to match her Valentino coat.
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The next royal to get married stands out in an intricate black Philip Treacy hat, paired with a periwinkle look by Paul Costelloe.
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QUEEN ELIZABETH II
The grandmother of the groom – and England's reigning monarch – shows her sunny side in an all-yellow design by her personal assistant Angela Kelly.
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Prince William's cousins – Amelia, Eliza and Kitty – form a perfect picture with their identical blonde locks and whimsical fascinators.
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DUCHESS OF CORNWALL
The stepmother of the groom complements her Anna Valentine champagne dress and two-tone coat with an airy Philip Treacy hat, one of up to 100 he's made for guests at the ceremony and parties.
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PRINCESS MATHILDE OF BELGIUM
The wife of the heir to the Belgian throne is terrific in teal, including her structured Philip Treacy hat.
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The singer leaves her hippie chic style behind, picking a classic wide-brim hat with embellishments to match her red sheath and cropped jacket.
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The Spanish princess is a vision in pink, down to her tulle-topped hat.
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VICTORIA BECKHAM AND DAVID BECKHAM
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The younger sister of Prince Charles blooms in a purple topper with netting and a large flower, matching her floral coat and violet dress.
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PRINCESS MICHAEL OF KENT
Accompanying her husband Prince Michael of Kent, the royal family member adds a swath of teal organza to her white hat.
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PRINCESS MARIE-CHANTAL OF GREECE
The fixture on international best-dressed lists proves her fashion mettle with a pewter Philip Treacy hat with sprays of roses.
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The Spanish monarch is a vision in violet, from her silk suit to her netting fascinator.
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The barrister picks regal purple for her sheer, layered hat while exiting the wedding with longtime partner, Labour Party leader Ed Miliband.
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Arriving on the arm of her former footballer husband Trevor, Brooking goes for layers of textured purple.
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QUEEN MARGRETHE II OF DENMARK
The Danish monarch picks head-to-toe aqua, including her feather spiral-topped chapeau.
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LADY FREDERICK WINDSOR
Born Sophie Winkleman, the daughter-in-law of the Duke and Duchess of Kent, is in the navy in her diamond-patterned suit and sculpted straw hat with festive twirls.
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SOPHIE, COUNTESS OF WESSEX
Prince Edward's wife stayed neutral in a beige Bruce Oldfield dress and coat with a rosette spray from Jane Taylor perched on the side of her blonde hair.
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The Swedish princess is a bright spot in her coral wrap dress and matching wide brim straw hat.
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SANTA MONTEFIORE AND TARA PALMER-TOMKINSON
The stylish sisters make quite a striking photo as they enter Westminster Abbey. Palmer-Tomkinson is a vision in blue, topping her Deborah Milner off-the-shoulder dress and matching Nicholas Kirkwood shoes with a rosette-topped fascinator by Philip Treacy, while her sister matches her multi-color Stephen Jones fascinator to her purple sheath dress and fur stole.
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The mother of the bride adds something blue in her sky blue silk dress and
matching passementerie coat by Catherine Walker (one of Princess Diana's
favorites), paired with a matching hat by Berkshire based milliner Jane
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Accompanying her husband, Deputy Prime Minister Nick Clegg, the Spanish
beauty adds a touch of flair to her black netted suit with a spray of red
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The wife of the House of Commons Speaker John Bercow adds a dash of whimsy
to her black lace sheath with a feathered fascinator.
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The wife of the Chancellor of the Exchequer George Osborne plays off her filmy gray dress with an elaborate swoop of feathers.
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DUCHESS OF KENT
The wife of Prince Edward, Duke of Kent, accents her Catherine Walker pink dress with a feather-bedecked fascinator from Philip Treacy.
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Hand in hand with her husband, journalist Tom Bradby, Claudia achieves great heights with her swooping, plumed topper by Jane Marcantonio.