It is a nervous day for any young groom but when you are Prince William, a future king, and you are about to marry your princess, the pressure is just that little bit greater, especially when you know that around two billion people around the world are watching.
The venue was historic Westminster Abbey.
William and his best man, his brother Prince Harry, arrived to cheers from thousands of well-wishers, for this, the most anticipated royal wedding since his mother Lady Diana married his father Prince Charles 30 years ago.
The Prince looked relaxed as he personally greeted guests. Almost 2,000 people were invited from around the world, including royalty, statesmen, politicians and celebrities.
But most of all it was about family and friends – over 1,000 of them. A proud day for his father Prince Charles and Charles’ second wife Camilla, Duchess of Cornwall.
Among the last to enter the Abbey were Her Majesty Queen Elizabeth II and Prince Phillip – or on a less formal note, the grandparents.
But of course there was still one more person to arrive. The star of the show, the leading lady – the bride Kate Middleton, and the first proper look at THAT dress, the best kept secret of the whole event until the day. The designer, as some people had guessed all along, was Sarah Burton, creative director at the Alexander McQueen fashion house.
As tradition dictates, Kate took the long walk down the aisle, accompanied by her father Michael Middleton. At one point Kate’s mother Carole looked a touch emotional, understandable given the occasion.
Prince Harry did what best men are supposed to do, keeping the groom in good humour with a joke or two.
The marriage ceremony, conducted by the Archbishop of Canterbury, went off without a hitch, as did the rest of the service.
Afterwards came what for many people will have been the highlight – the royal procession back to Buckingham Palace in the open-topped state carriage, the crowds by now even bigger and louder.
Following the procession, hundreds of thousands of well-wishers filled the Mall and surrounded the palace for one last highlight – the appearance of the newly-weds on the famous balcony.
And there, they sealed their vows with a long-awaited kiss to the delight of the crowd.