Buckingham Palace say the Queen and Duke of Edinburgh will miss the christening in a decision which was mutually agreed by the Queen and the Cambridges some time ago. We also love that sly smile that Prince William gives his daughter after her comments indicating this isn't the first time Charlotte's spoken her mind.
He is also one of Queen Elizabeth's seven great-grandchildren.
It was worn for all royal christenings until 2008, when the Queen commissioned her dressmaker, Angela Kelly, to make a replica in order to preserve the original, the Palace said.
For the christening of George, Kate and Will's first born, in October 2013, Kate again wore a cream Alexander McQueen coat-dress, this one with a large ruffle down the center of her chest and on her waist.
They chatted briefly with the Archbishop before entering the chapel, followed by the Duke and Duchess of Sussex.
Following the 40-minute traditional religious service, guests attended a private tea which included slices of christening cake, from a tier taken from the duke and duchess' wedding cake.
Proud grandfather the Prince of Wales and Duchess of Cornwall did attend, along with the Duke and Duchess of Sussex who walked hand-in-hand.
It was a big day for Prince Louis.
The six godparents and their spouses were also due to attend.
According to tradition, water from the River Jordan was used at the christening. While Princes William and Harry looked smart in coordinating navy blue suits.