Tens of thousands of Royal fans flocked to Buckingham Palace and the Mall to catch a glimpse of the pomp and pageantry surrounding the celebration for Queen Elizabeth.
In addition to Prince Philip, who retired from his royal duties in August, Prince Louis's absence was felt from the annual Trooping the Colour tradition, where older siblings George and Charlotte had a blast watching the military airshow.
The Duchess, wearing a pink Caroline Herrera ensemble with a matching hat by Philip Treacy, carried out her role with the poise and grace we've already come to expect from the former actress and humanitarian. He had a hip operation in April and retired from public life past year. So, three weeks after herwedding, which was followed by an outing at a Buckingham Palace garden party for the charities and organizations tied to Prince Charles, who turns 70 this year, Meghan is now plunging-carefully and deliberately-into royal life.
The day's proceedings closed with an RAF flypast, which was watched by members of the royal family from Buckingham Palace's balcony.
The 92-year-old Queen, whose real birthday is April 21, seemed vigorous as she keenly observed the event.
The Queen cut a lonely figure as she attended Trooping the Colour alone, without Prince Phillip by her side.
The Queen soon made her entrance onto Horse Guards in an Ascot Landau after making her journey from her famous London home Buckingham Palace.
Taking to Twitter, the Duchess wrote: "Very proud of The Duke Of York Colonel of the Grenadier Guards". Meghan has become particularly close to her father-in-law, who walked her down the aisle and was instrumental in helping Meghan and Harry with wedding planning.
About 1,000 soldiers marched to House Guards Parade in Whitehall, central London, as part of the ceremony, which marked Queen Elizabeth's 92nd birthday.