Prince George has been christened in a ceremony at St James's Palace that was attended by four generations of the royal family.
The baby boy was pink cheeked and chubby as he emerged from the historic Chapel Royal with his parents, the Duke and Duchess of Cambridge, after the service.
The Queen and Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall and Prince Harry gathered for the private ceremony of the future king and supreme governor of the Church of England.
Before entering the chapel, William told everyone: "He's all ready. So far, so good."
Prince George was dressed in a Honiton lace christening gown, a replica of the one used by more than 60 members of the Royal Family since 1841.
Kate looked relaxed before the service began and wore a cream Alexander McQueen outfit and a matching hat by milliner Jane Taylor.
Other guests include Kate's family - parents Carole and Michael Middleton and siblings Pippa and James - along with his godparents and their partners.
Harry and Pippa both gave readings and William and Kate chose two hymns, two lessons and two anthems for the service.
The Lily font used by the Archbishop was brought to the Chapel Royal from the Tower of London where it is normally housed as part of the crown jewels.
While the Queen, Prince Charles and Prince William were all christened at Buckingham Palace, the Duke and Duchess have chosen to break with tradition, holding the baptism in the Chapel Royal at St James's Palace.
It is the chapel where Diana, Princess of Wales' coffin rested before her funeral in 1997.
Earlier, Kensington Palace revealed the names of Prince George’s seven godparents .
They are Zara Tindall, Oliver Baker, Emilia Jardine-Paterson, Earl Grosvenor, Julia Samuel, William van Cutsem and Jamie Lowther-Pinkerton.
Mr Lowther-Pinkerton is William and Kate's former private secretary, who continues to serve part-time as their principal private secretary and equerry.
Mr Baker is an old university friend who attended St Andrews with William and Kate, while Earl Grosvenor, whose first name is Hugh, is the son of the Duke of Westminster.
Ms Samuel was a close friend of Diana, Princess of Wales, and is the founder patron of Child Bereavement UK, which has William as its royal patron.
Mr van Cutsem is an old family friend of William and Harry, while Ms Jardine-Paterson is an interior designer and an old Malborough College friend of Kate, who also uses her maiden name d'Erlanger in her working life.