The Queen and Prince Phillip will not be attending the event, as Her Majesty is travelling back from Norfolk today.
The Duchess of Cambridge looked stunning at Prince Louis' christening on Monday, and since the Queen and Prince Philip did not attend the special day, it is thought that Kate paid tribute to her son's great grandmother by wearing a pair of earrings much like the Queen's.
Prince Louis' christening was the first time that the Duke and Duchess of Cambridge made a public appearance with all of their children. Princess Charlotte looked precious in a blue dress and matching headband while Prince George sported a short-sleeved white shirt and navy shorts.
The Palace confirmed that the hymns were, "O Jesus, I Have Promised" and "Lord of All Hopefulness", with the lessons being from St. Mark 10: 13-16, read by Miss Lucy Middleton, and Ephesians 3: 14-19, read by Mr Guy Pelly.
Meghan was christened and confirmed in the oak-panelled Chapel Royal by the archbishop, who also married her and Harry in May.
After the ceremony, the Duke and Duchess of Cambridge will serve guests christening cake, taken from one of the eight tiers of their seven-year-old wedding cake, at a private tea. When Prince Louis was born she tickled everyone with her confident waving at cameras as she strolled up the steps of the Lindo Wing.