Newlyweds Prince Harry and Meghan, who looked stylish in an olive-green Ralph Lauren outfit and Stephen Jones hat, were also in attendance, along with Louis' siblings Prince George, 4, and Princess Charlotte, 3.
Welcome (officially) to the world, little Prince Louis.
Prince William served a stint in the RAF Search and Rescue service in North Wales, and Prince Harry also briefly took part at RAF Shawbury.
The Archbishop of Canterbury, Justin Welby, also married Prince Harry and Meghan Markle at their wedding last month, and called his forthcoming duty at Prince Louis' christening "very nerve wracking" but also "a great privilege".
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Royal christenings are steeped in tradition, with customs passed down through the generations.
This was the first time the Duke and Duchess of Cambridge stepped out with all three children.
This afternoon, thousands of people lined the palace approach in central London, to watch a ceremony hosted by the Queen and culminating in the historic flypast of bombers, old and new, along with spy planes, helicopters and transporters.
Following the 40-minute service, The Duke and Duchess of Cambridge gave a private tea at Clarence House. He is fifth in line to the throne.
Once the brief ceremony concluded, the royal family made for the exits - with Princess Charlotte offering a parting wave to the cameras. So it is no wonder that both Prince William and Prince Harry appeared honored to be present for the celebrations. Picture: AAPNicholas van Cutsem is another godparent. She is the daughter of the 8th Earl of Romney. She is the wife of Robert Carter, who belongs to a family of wealthy landowners.
They include the Duchess' cousin Lucy Middleton and Guy Pelly, a childhood friend of William's.