It was a full house at Sandringham as four generations gathered for the festivities on the Norfolk estate.
The Duke and Duchess of Cambridge looked relaxed as they made the journey to St Mary Magdalene Church on foot holding hands.
But there was no sign of Prince George as temperatures stayed just above freezing.
Wearing a tartan Alexander McQueen coat and a hat by Gina Foster, Kate smiled and waved to the crowds.
As she left the service, she stopped to chat to Cicely Howard, 75, from Great Yarmouth, who asked about the baby.
The little prince has a name! The Duke and Duchess of Cambridge have announced that he will be called George Alexander Louis.
The baby will be known as His Royal Highness Prince George of Cambridge
The little prince has got a name! The Duke and Duchess of Cambridge have announced that he will be called George Alexander Louis.
First pictures of the vehicles carrying the Royal baby and his parents arriving in Bucklebury.
WIlliam and Kate, along with the new arrival, leave Kensington Palace on their way to the Middleton family home in Bucklebury.
William and Kate have arrived home in Bucklebury with their new son. More shortly.
The Duke and Duchess of Cambridge have left Kensington Palace with their newborn son. It is unclear at this stage where the royal couple and the prince are travelling to.
The Royal baby wasn't the only special delivery today, hospitals across the region were celebrating new arrivals.
At the Queen Alexandra, in Portsmouth, they gave special gifts to babies that shared their birthday with the Royal Prince. This from Mel Bloor who meets new mothers Terry Hayter and Yasmin Khan and Debbie Parkinson of Hampshire Hospitals NHS Foundation Trust.