The nine-week-old was welcomed into the Christian faith as parents the Duke and Duchess of Cambridge and older brother Prince George looked on.
Great-grandparents the Queen and the Duke of Edinburgh, grandparents the Prince of Wales and Carole and Michael Middleton, step-grandmother the Duchess of Cornwall and Kate’s siblings Pippa and James Middleton joined Charlotte’s five godparents for the celebratory occasion.
The Most Rev Justin Welby, the Archbishop of Canterbury, performed the baptism — a must for royal babies — using the ornate silver gilt Lily Font which is part of the Crown Jewels.
The Princess was christened using holy water from the River Jordan, where it is said Jesus was baptised by John the Baptist.
Charlotte was pushed to her christening in a vintage pram — which the Queen used for two of her own children — in what was only the royal infant’s second appearance in public.
Kate strolled from Sandringham House to the Church pushing the large traditional silver wheeled Millson pram — once used for the Duke of York and the Earl of Wessex — while William held George’s hand as the prince, who is nearly two, waved at the crowds, estimated at 3,500 people.
After a short service lasting just over half an hour, the royals began emerging from the church.
Charlotte was christened in a replica of the intricate lace and satin christening gown made for Queen Victoria’s eldest daughter, Victoria, the Princess Royal, in 1841. The original is too delicate to wear and its exact copy is now used for royal baptisms.
Just 21 guests were among the congregation including the princess’s godparents. They are Diana, Princess of Wales’ niece and William’s cousin Laura Fellowes; Kate’s cousin Adam Middleton; Sophie Carter — a long term confidante of Kate’s; William’s Eton school friend James Meade; and one of his best friends since childhood Thomas van Straubenzee.
Hundreds of royal fans — some of whom camped out overnight — founds spots inside the paddock – the name given to the area outside the church — after William and Kate gave permission for the area to be open to the public.