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.
Just 22 guests will be at the intimate service - the godparents and six spouses (Earl Grosvenor is not married), the Duchess's parents and two siblings Pippa and James, and the Queen, Duke of Edinburgh, Prince of Wales, Duchess of Cornwall and Prince Harry.
Prince George will wear a handmade replica of the Honiton lace royal christening robe, the original of which dates back to Victorian times, and will be baptised with water from the River Jordan in the Lily Font at the Chapel Royal.
Following the service, which will be conducted by the Archbishop of Canterbury, the Prince of Wales and the Duchess of Cornwall will give a private tea in Clarence House where guests will be served slices of the christening cake, which is a tier taken from the Duke and Duchess's wedding cake.
Official pictures by the photographer Jason Bell will be taken in Clarence House and released to the media on Thursday night.