The royal pair both attended Prince George's 2013 christening and Princess Charlotte's service back in 2015.
In addition to the cake, Prince Louis's christening gown was also recycled.
The christening of Prince Louis will take place inside The Chapel Royal, a location with strong ties to the royal family. During the ceremony, his seven godparents were also named, including Prince William's cousin Zara Tindall and many of their closest friends.
8 rescued from Thai cave, but 5 remain trapped
Narongsak said experts told him the new rain could shrink the unflooded space where the boys are sheltering to 108 square feet. Saman Kunan's death raises serious doubts over the safety of attempting a rescue through the cave's waterlogged passageways.
The royal family is gathering to celebrate Prince Louis's christening today, and Uncle Harry reportedly bought little Louis the ideal gift for the occasion. Guy Pelly has been a longtime friend of the Kate and Will and Harry Aubrey-Fletcher went to Ludgrove School and Eton with Prince William.
Prince George, four, and three-year-old Princess Charlotte held William's hand, as a sleeping Louis was carried into the chapel by Kate.
Kate's choice of outfit for Prince Louis' christening was not surprising, as the Duchess had previously matched her dresses to compliment the cream colours of the lace and satin Royal Christening Robe worn by her 11-week-old son.
There for the ceremony were Louis's grandfather the Prince of Wales, step-grandmother the Duchess of Cornwall and maternal grandparents Carole and Michael Middleton. As the palace further explains, "the original gown was subsequently worn for all Royal christenings, including The Queen, her children and her grandchildren".
England makes final four for 1st time since '90
■ JOE HART opted not to watch England secure their semi-final place and played cricket for hometown club Shrewsbury instead. Former England goalkeeper David Seaman believes Jordan Pickford is relishing proving his critics wrong at the World Cup .
The Chapel is located within the grounds of St James's Palace, in London, and has been home to many significant royal events throughout history. Buckingham Palace said this decision was taken by the Queen, William and Kate "some time ago" and is not due to health reasons.
It's days like today that make being a mom so special for Kate Middleton.
The Duke and Duchess of Sussex will attend, along with the Cambridges, Prince Charles and Camilla, the Middleton family and Prince Louis' godparents.
Gal Gadot Visited a Children's Hospital Dressed Up as Wonder Woman
Lucas Collazo wrote: 'Thank you [Gal Gadot] for visiting us Inova Health Children's Hospital. She said during an interview past year that giving birth made her feel like Wonder Woman .