Prince William, Prince George, Kate Middleton

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The big day has arrived! After Prince George's godparents and relatives entered the Chapel Royal in St. James' Palace on Wednesday, Oct. 23, Prince William and Kate Middleton gave the first glimpse of their 3-month-old son since his first official portraits were unveiled in late August. The Archbishop of Canterbury, Justin Welby, will preside over the intimate service.

Prince George was dressed in a handmade replica of the royal christening robe, made by Angela Kelly, dressmaker to Queen Elizabeth II.

Kate's parents, Michael and Carole, arrived with her siblings, Pippa and James. William's younger brother, Prince Harry, came with his grandmother, as well as Prince Philip, Prince Charles and Camilla Parker Bowles.

Prince George, Prince William, Kate Middleton

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Hours earlier, the palace announced that seven people will share the responsibility of being George's godparents: Oliver Baker, Emilia Jardine-Paterson, Earl "Hugh" Grosvenor, Jamie Lowther-Pinkerton, Julia Samuel, Zara Tindall and William van Cutsem.

The royal baby will be baptized in the Lily Font using water from the River Jordan. Queen Victoria and Prince Albert commissioned the silver font for the birth of their first child, Victoria, Princess Royal, in 1840. It has been used at every royal christening since 1841.

George's parents already bucked tradition by hosting the event in St. James' Palace as opposed to Buckingham Palace. "William and Kate are going to do things differently, and actually, their families are respectful of that," a royal source previously told E! News. "This won't be a case of a big rift. Christenings are not state occasions. They're private affairs and can be as big or intimate as the parents desire."

Prince William, Prince George, Kate Middleton

John Stillwell - WPA Pool /Getty Images

Following the 45-minute service, Prince George's paternal grandparents will host a private tea in Clarence House. Guests will be served slices of christening cake, which is a tier taken from the Duke and Duchess of Cambridge's wedding cake.

George's parents have chosen Jason Bell as the official photographer for their son's christening. The pictures will be revealed on Thursday, Oct. 24.

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