Best Hats of the Royal Wedding

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.

The next royal to get married stands out in an intricate black Philip Treacy hat, paired with a periwinkle look by Paul Costelloe.

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.

Prince William's cousins – Amelia, Eliza and Kitty – form a perfect picture with their identical blonde locks and whimsical fascinators.

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.

The wife of the heir to the Belgian throne is terrific in teal, including her structured Philip Treacy hat.

The singer leaves her hippie chic style behind, picking a classic wide-brim hat with embellishments to match her red sheath and cropped jacket.

The Spanish princess is a vision in pink, down to her tulle-topped hat.

The expectant star designer matches a swingy

navy dress from her own collection to a dramatic floral Philip Treacy

fascinator. Her handsome husband is by her side

in a traditional top hat, also from Treacy, paired with his Ralph Lauren

suit and Order of the British Empire.

The younger sister of Prince Charles blooms in a purple topper with netting and a large flower, matching her floral coat and violet dress.

Accompanying her husband Prince Michael of Kent, the royal family member adds a swath of teal organza to her white hat.

The fixture on international best-dressed lists proves her fashion mettle with a pewter Philip Treacy hat with sprays of roses.

The Spanish monarch is a vision in violet, from her silk suit to her netting fascinator.

The barrister picks regal purple for her sheer, layered hat while exiting the wedding with longtime partner, Labour Party leader Ed Miliband.

Arriving on the arm of her former footballer husband Trevor, Brooking goes for layers of textured purple.

The Danish monarch picks head-to-toe aqua, including her feather spiral-topped chapeau.

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.

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.

The Swedish princess is a bright spot in her coral wrap dress and matching wide brim straw hat.

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.

Prince Harry's date tops her custom Alberta Ferretti suit with a beige netting-topped fascinator.

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

Corbett.

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

roses.

The wife of the House of Commons Speaker John Bercow adds a dash of whimsy

to her black lace sheath with a feathered fascinator.

The wife of the Chancellor of the Exchequer George Osborne plays off her filmy gray dress with an elaborate swoop of feathers.

The wife of Prince Edward, Duke of Kent, accents her Catherine Walker pink dress with a feather-bedecked fascinator from Philip Treacy.

Hand in hand with her husband, journalist Tom Bradby, Claudia achieves great heights with her swooping, plumed topper by Jane Marcantonio.