George was dressed in an elaborate lace and satin christening gown that's a replica of one made in 1841 for the christening of Queen Victoria's eldest daughter.
Being baptized into the church is more significant for George than for most people, since he is in line to become king, which would also make him the supreme governor of the Church of England.
The occasion was kept uncharacteristically small, in a shift away from the larger ceremonies that his father and grandfather enjoyed at Buckingham Palace....
The Archbishop of Canterbury, the Most Rev. Justin Welby, greeted the guests as they arrived at the chapel.
The royal baby, who was born in July, has seven godparents, among them Prince William's cousin Zara Tindall, daughter of Princess Anne, and close friends of the couple.
They include Oliver Baker, who got to know William and Catherine at St. Andrew's University, Emilia Jardine-Paterson, who went to school with Catherine, and William van Cutsem, a childhood friend of William.
The other godparents are Jamie Lowther-Pinkerton, a former private secretary to the Duke and Duchess of Cambridge and Prince Harry; Julia Samuel, who was a good friend of William's mother, Diana, Princess of Wales; and Earl Grosvenor, son of the Duke of Westminster.
The replica christening gown was brought into use in 2008 to help preserve the 170-year-old original, used until then for every royal christening, including those of Prince William and his father, Charles.
The venue for the christening also has a special significance for Prince William. The body of his mother, Diana, rested in the Chapel Royal for five days before her funeral in 1997.
After the service, Prince Charles and Camilla, Duchess of Cornwall, held a private tea at Clarence House. The guests were served slices of christening cake, which is a tier taken from William and Catherine's 2011 wedding cake.
Image: Christening gown and cross, via Shutterstock