The Queen spoke proudly as the RAF's Air Commodore-in-Chief and also in remembrance of the Battle of Britain, in which her father King George VI served.
The christening itself is quite the family tradition, Royal Central U.K. notes, adding Prince Louis also wore a replica of the now-famous Honiton lace christening gown.
Pippa Middleton, who is expecting her first baby in the fall, was among the first of the guests to arrive at the chapel.
Louis will have six godparents, including close friends and family members of the royal couple.
Accompanying the duchess was Prince William, who held Princess Charlotte and Prince George by the hand. Meghan Markle, the Duchess of Sussex, wore an army green Ralph Lauren dress and hat by Stephen Jones.
So you can only imagine my glee at seeing all the pics from the christening of Prince Louis of Cambridge.
Click through the slideshow to see who has been named a godparent to Prince Louis... Pint-sized Prince George looks cute as a little button in his navy blue shorts and white top with Peter Pan collar and blue piping around the sleeves. His brother, William van Cutsem, is Prince George's godfather.
Lucy Middleton: She is the Duchess of Cambridge's cousin and a solicitor. He helped organize William's bachelor party and is married to an American, Holiday Inn heiress Lizzie Wilson.
Aubrey-Fletcher is yet another longtime friend of William's, according to People. Coincidentally, William and Kate attended the wedding of Robert and Hannah on their own one-year wedding anniversary in 2012.
The now seven-year-old cake is a tier taken from The Duke and Duchess of Cambridge's wedding cake when the pair Wednesday in 2011.
She is also godmother to Princess Charlotte.