Princess BeatriceThe Princess' larger than life bow-motif hat paired perfectly with her Valentino suit – and was a work of art that sparked internet memes worldwide, making her one of the most famous invitees at the nuptials. Photo: Getty Images
Princess EugenieIt was all about the blue for Eugenie. Her smaller topper was embellished with feathers and a contrasting bloom. Photo: Getty Images
Zara PhillipsZara held on to her hat she walked through the crowds. Opting to go for a look that would drape over the side, Zara's black hat added more modern flair to her metallic dress. Photo: Getty Images
The Duchess of CornwallCamilla went for a more classic look with her oversized woven headwear.Photo: Getty Images
Victoria BeckhamThen pregnant with little Harper, Victoria Beckham's navy satin hat had a touch of drama and sparkle.Photo: Getty Images
David BeckhamIt wasn't just the ladies who wore hats for the occcasion. David Beckham's top hat stole the show although it stayed in his hand for the majority of the ceremony. Photo: Getty Images
Lady Frederick WindsorTwo and a Half Men actress Sophie Winkleman, a.k.a. Lady Frederick Windsor, also chose a navy blue style. Photo: Getty Images
Queen Mathilde of BelgiumThe then-Crown Princess went for a full coverage blue hat, with a black bow accent on top. Photo: Getty Images
Tara Palmer-TomkinsonTara Palmer's something blue was head-to-toe! Her futuristic headwear was adorned with a large rose. Photo: Getty Images
Princess Michael of KentPrincess Michael's two-hued hat was perfectly set off by her pearl jewelry and handbag. Photo: Getty Images