Prince William and Kate Middleton chose leading portrait photographer Matt Holyoak to snap the photos, and he definitely lived up to his reputation.
Prince Louis Arthur Charles was born on 23 April 2018 in the Lindo Wing of St Mary's Hospital in London as the third child of the Duke and Duchess of Cambridge.
Also attending were Kate's parents, her brother and sister and Louis' six godparents, who are close friends or relatives of William and Kate.
In one photo, she's seen smiling down at her son - who's wrapped up in his royal gown for the day out.
"I was truly honored at being asked to take the official photographs at the christening of Prince Louis, and to witness at first hand such a happy event", Holyoak said in a statement, according to People.
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Louis was fast asleep as he was taken in the Chapel Royal by Kate for the ceremony that lasted 40 minutes.
Louis was carried into the chapel by his mother, wearing the handmade replica of the royal christening robe, which in 2008 replaced the original that had been worn for all royal christenings since that of Queen Victoria's eldest daughter in 1841.
"I only hope I have captured some of that joy in my photographs".
This is the first time Prince William and Kate have posed for picture as a family of five, with Princess Charlotte and Prince George looking just as adorable as ever. Holyoak has worked with a host of celebrities and his photos have regularly been splashed on the covers of magazines such as Harper's Bazaar, Shortlist and Dazed And Confused.
The christening photos are the first without the Queen, who missed her great-grandson's baptism, which took place in a private ceremony.
The Duke and Duchess of Cambridge have selected different photographers to capture the official portraits for each of their children's christenings.