The Queen and Prince Philip were not in attendance.
The Cambridges stepped out for the first time ever as a family of five, with Kate carrying her serenely sleeping prince, while dad held the hands of both George and Charlotte.
Kensington Palace has not released the guest list, but newlyweds the Duke and Duchess of Sussex are expected to attend, along with Kate's pregnant sister Pippa Middleton and their brother James Middleton.
Royal expert Richard Fitzwilliams even predicted to the site that "emphasis could be firmly be on their close friends" when making the decision, as the couple did not choose any Royal Family members to be Princess Charlotte's godparents in 2015 and did not choose any immediate family members to be Prince George's in 2013.
Prince Louis will be christened later in a private ceremony in the Chapel Royal at St James's Palace later today.
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Petersburg, also at 19:00. 'Of course there is some power left for the English, ' he told a post-match press conference. But there have been four shootouts in Russian Federation so far, with the team going second winning every single time.
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Along with this, the duo were also spotted attending the pre-engagement festivities of Akash Ambani and Shloka Mehta in Mumbai. The American singer was in India to attend Priyanka's housewarming party and meet her mother Madhu Chopra.
The family of five stepped out for the first time looking picture ideal. His sister looked sweet as ever in a pretty blue floral print dress, a matching Alice headband and the most adorable blue Mary Jane shoes with white socks.
They also chose two anthems for the choir to sing - This is the Day which the Lord hath Made, written for their wedding in 2011 by John Rutter, and Suo Gan, a traditional Welsh lullaby. Meanwhile the design, although reminiscent of a lady's flowing dress (and reportedly made to reflect Queen Victoria's own wedding gown), was considered unisex and graced both male and female babies.
Look through this gallery to see adorable pictures of His Royal Highness Prince Louis of Cambridge.
While the royal christening was stepped in tradition, it also saw some remarkably elegant fashion choices.
Louis Arthur Charles, was born weighing 8lb 7oz on April 23, 2018.