Kate arrived in a red coat by Catherine Walker and matching fascinator, while Meghan arrived in a cream coat and Victoria Beckham dress.
With 60 per cent of the populations of the 53 nations under the age of 30, much of the service was targeted towards young people. There was a performance from Grammy-award winning group Clean Bandit and the UK’s biggest-selling tenor, Alfie Boe. And a reflection was set to be given by Lewis Pugh, an endurance swimmer, ocean advocate and the UN Patron of the Oceans — representing a cause that has been championed by Charles and his sons, Harry and William.
This year marks the 70th anniversary of the modern Commonwealth, which encompasses almost 2.4 billion people, a third of the world’s population. And the young nature of the Commonwealth populations has led to Harry being named as the Youth Ambassador for the organisation by his grandmother last year. He and wife Meghan are making the Commonwealth a central part of their public life.
While in the service, Meghan was seen having a lively conversation with her father-in-law, the Prince of Wales, while Kate chatted up Duchess Camilla.
It will also come as no surprise to many, that Meghan and Harry shared a sweet moment once seated inside. The moment, highlighted on Twitter by royal reporter Victoria Murphy, took place during the first performance of the day by Grammy-winning band Clean Bandit. Harry, really feeling the moment, was spotted nodding along to the music before realising that his grooving was being broadcast on the church's giant screens.
You can watch the moment below.
WATCH: Meghan Markle And Kate Middleton Reunite At Buckingham Palace.