Look through this gallery to see adorable pictures of His Royal Highness Prince Louis of Cambridge.
He was baptized at the Chapel Royal on the grounds of St James's Palace in London, just like his older brother George. Her woven Jane Taylor hat had a large flower and netting on one side.
Wearing an adorable blue and white patterned dress - she wore an nearly identical version of the look in July 2017, while on a visit with her parents to Berlin - the royal teamed the look with a matching blue bow headband in her hair.
Prince Louis was carried into the chapel by his beaming mother, wearing the handmade replica of the Royal Christening Robe, which in 2008 replaced the original which had been worn for all royal christenings since that of Queen Victoria's eldest daughter in 1841.
Welby baptised Louis by pouring holy water from the River Jordan over his head.
The service for Prince Louis at the Chapel Royal in St James' Palace in London was attended by guests including Prince Charles and his wife Camilla, and Kate's parents and siblings, including her sister Pippa Middleton, who is pregnant.
Following the service, The Duke and Duchess of Cambridge are set to give a private tea at Clarence House.
The New Orange Is The New Black Trailer Just Dropped
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The Cambridges have previously chosen close friends and confidantes for the role.
Anwar Hussein via Getty Images The Duke and Duchess of Cambridge leave St. Mary's Hospital with newborn Prince Louis on April 23, 2018. He has been banned from driving three times, including twice for drink-driving and once for speeding.
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Mrs Carter is a schoolfriend of the Duchess, while Miss Middleton, a solicitor, is her cousin.
Harry Aubrey-Fletcher: He went to Ludgrove School and Eton with William and his father is the Lord Lieutenant of Buckinghamshire.