Clutching an invitation to one of the biggest occasions of the year, guests have pulled out all the stops to impress with their fashion choices.

With more than two billion people due to watch the occasion, Westminster Abbey was decorated in a rainbow of colourful outfits, along with a sea of hats.

Prince Harry's on-off girlfriend Chelsy Davy was seen in an Alberta Ferretti aqua green satin top, slightly off-the-shoulder with bow detail at the back. She had donned a small beige fascinator-style hat with netting.

Miss Davy has apparently chosen another custom-made look by the Italian designer for the evening - an asymmetric, midnight blue satin gown.

Singer-turned-fashion-guru Victoria Beckham chose one of her own designs in dark blue to suit the big day.

The singer turned fashion guru was wearing an outfit from her latest elegant AW11 collection, which she unveiled at New York Fashion Week in February. It was accessorised with a hat by celebrated milliner Philip Treacy.

And she has collaborated with Christian Louboutin to customise a pair of the French designer's desirable shoes.

Her husband chose to wear tails with a high collar and his OBE pinned to his lapel.

David Beckham, with a 1920s-style slicked-back hairstyle, was wearing a Ralph Lauren morning suit and carrying a top hat.

Cementing their position as the most hotly-dressed couple, pregnant Victoria covered her baby bump with her deep-blue dress.