Most recently, Prince George was baptised within the Chapel in 2013 by the same reverend who will officiate Louis' ceremony, Archbishop of Canterbury Justin Welby.
Queen Elizabeth II and Prince Philip couldn't make it to the event.
Prince Louis was christened at The Chapel Royal at Saint James's Palace in London, England, on Monday. As the palace further explains, "the original gown was subsequently worn for all Royal christenings, including The Queen, her children and her grandchildren".
The 36-year-old arrived hand-in-hand with her husband the Duke of Sussex ahead of the service at the Chapel Royal at St. James's Palace in London.
Prince Louis was born on April 23 and is a younger brother to Prince George, 4, and Princess Charlotte, 3. According to the Press Association, "The decision was not made on health grounds, Buckingham Palace says, and it is understood to have been mutually agreed by the Queen and the Cambridges some time ago".
Democratic lawmakers, liberal groups rally against Brett Kavanaugh, Trump’s Supreme Court nominee
The others are Republican targets for the confirmation vote who come from Trump-won states where they face re-election this fall. Susan Collins of ME and Lisa Murkowski of Alaska, who have shown concern in the past about preserving access to abortion rights.
The Duke and Duchess have asked six close friends and family members to become Louis' godparents.
They include Kate's cousin Lucy Middleton, Nicholas van Cutsem, whose daughter was a bridesmaid at May's wedding of Harry and Meghan, and Guy Pelly, a childhood friend of William's.
Prince William and the former Kate Middleton later hosted a tea at Clarence House, where they served a christening cake made from a tier of their wedding cake, the palace said.
The frilled satin dress is a replica of the baptism garment first worn by Queen Victoria's eldest daughter, Victoria Adelaide Mary Louisa, back in 1841.
It's days like today that make being a mom so special for Kate Middleton.
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