Prince George's christening has been organised down to the very last detail, evident already by his cream gown matching that of his mother Kate.
Crowds gathered to catch a glimpse of the three-month-old royal baby as the small congregation entered the church.
Not even the threat of an odd rain shower could wipe the smiles from a grinning Kate and Will as they waved from the car.
Kate wore an Alexander McQueen dress suit, the same designer she wore on her wedding day in April 2011.
Her hair was styled in a partial up-do for a refreshing change.
William skipped the colour-coordinated outfits and instead opted for a white shirt and blue tie.
The baby prince is being christened today in an intimate 45-minute ceremony in the Chapel Royal of St James's Palace.
Only five members of Britain's royal family have been invited by the Duke and Duchess of Cambridge to today's "intimate" christening of Prince George.
Prince Andrew and Prince Edward are among those who have been left off the guest list so Prince William and Kate could invite close friends.
William's cousins Princesses Beatrice and Eugenie and Zara and Peter Phillips will also miss out.
The couple's choice of the Chapel Royal at St James's Palace as the venue for the ceremony meant the guest list had to be kept down to fewer than 50, meaning there would not have been room for close friends if the couple's various aunts, uncles and cousins attended.
The only members of the royal family who will be there, apart from baby George and his parents, are the Queen, the Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall and Prince Harry.
Zara Phillips, the Duke of Cambridge's cousin, is the only member of the royal family named as a godparent to Prince George.
She is one of seven godparents chosen by the Duke and Duchess, joining old friends from their school and university days, as well as members of the aristocracy, on the list.
However many have surprised at the omission of Prince Harry and Pippa Middleton.
A close friend of Diana, Princess of Wales has also been chosen as a godparent for today's service at the Chapel Royal in St James's Palace, where the Princess lay at rest before her funeral in 1997.
Among the more predictable names on the list are Jamie Lowther-Pinkerton, the Duke and Duchess's principal private secretary, who has worked for the Duke since 2005, and William van Cutsem, one of the Duke's oldest friends.
The other names on the list, however, were not widely predicted. They are Oliver Baker, a friend of the Duke and Duchess who was at St Andrews University with them, Emilia Jardine-Paterson, who was at Marlborough College with the Duchess, Earl Grosvenor, the son of the Duke of Westminster, and The Hon Julia Samuel, who was a close friend of the Princess of Wales.