The christening of Prince Louis was held in the Chapel Royal at London's St James's Palace on Monday afternoon and the royal family looked in great spirits - and totally stylish - for the special event.
The three-year-old was seen confidently shaking hands with the Archbishop of Canterbury and The Dean of The Chapel Royal, The Right Reverend and Right Honourable the Lord Chartres before heading inside for the ceremony.
Welby baptized Louis by pouring holy water from the River Jordan over his head.
The 11-week-old prince was fast asleep as Kate carried him into the chapel.
As Kate chatted to the archbishop while holding Louis, she could be heard describing her sleeping son as "very relaxed and peaceful".
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He is one of Queen Elizabeth's 7 great-grandchildren.
In what was only her second public appearance since the royal wedding, the Duchess of Cambridge chose a cream-coloured Alexander McQueen dress that perfectly complemented Prince Louis's Honiton lace christening robes.
Middleton, who is now five-months pregnant with her first child with husband James Matthews, hid her baby bump under the long-sleeved pleated gown. "Robinson Crusoe was William's favorite book, but Harry loved all things, [A.A.] Milne".
According to Kensington Palace, the couple named several of their closest friends along with a few distant relatives as the prince's godparents including Mr. Nicholas van Cutsem, Mr. Guy Pelly, Mr. Harry Aubrey-Fletcher, The Lady Laura Meade, Mrs. Robert Carter, and Miss Lucy Middleton.
This isn't the first time the young royal's confident personality has come out after she was caught excitedly skipping at a polo event with her mum, Kate Middleton. As the palace further explains, "the original gown was subsequently worn for all Royal christenings, including The Queen, her children and her grandchildren".
William and Kate were to host a private tea afterwards. "Guests will be served slices of christening cake, which is a tier taken from The Duke and Duchess of Cambridge's wedding cake".