Picture gallery: Fashions on show at Royal Wedding

Clutching an invitation to one of the biggest occasions of the year, guests 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.

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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.

Socialite Tara Palmer-Tomkinson, friend of the Royal Family, impressed with a royal blue dress with matching wrap and elbow-length gloves.

The 39-year-old, with her hair in an elegant chignon, treated the crowd to a 'royal wave'.

She did not miss out on the chance to don a hat fit for the occasion - with a matching royal blue creation, as well as peep-toe high heels, again in royal blue.

Speaker John Bercow and his wife Sally joined the fashion parade. He wore a morning suit while his wife towered over him in heels, wearing a knee-length grey and black patterned dress with a slit at the front and a plunging neckline. Mrs Bercow topped off her outfit with a fascinator with a black detail.

Elton John and partner David Furnish both wore morning suits. Sir Elton, a friend of William's mother, wore a purple tie and ivory waistcoat, while Mr Furnish donned a dark grey tie and light-grey waistcoat.