She paired the look with nude heels and a clutch.
The Queen was joined at the various ceremonies during the day by various children and grandchildren, including Prince William, Prince Charles, Princess Anne the Princess Royal, Prince Andrew and Prince Edward and their spouses.
100 planes travelled across the skies to mark the 100th birthday of the Royal Air Force.
It's expected that the former actress will receive an honour in time, as her husband Prince Harry served in the British Armed Forced for 10 years.
The Duchess stepped out in an Emilia Wickstead dress during her first official global trip, proving there's no drama with the British designer despite a rumoured controversy.
Brexit row: Jeremy Hunt replaces Boris Johnson as United Kingdom foreign minister
But as Foreign Secretary in May's government, he was prone to gaffes and criticized for not being on top of his brief. Dominic Raab, the former minister of state for housing and planning, was named the new Brexit secretary.
The couple met RAF servicemen and women, charity representatives involved in the RAF100 Appeal, RAF Veterans and Civil Service personnel involved in the Centenary celebrations.
The 36-year-old paid tribute to her host country wearing a green top and matching skirt by her wedding dress designer, Givenchy. A service at Westminster Abbey was followed by a spectacular flypast over Buckingham Palace that saw around 100 aircraft taking part.
Harry and Meghan are in Ireland for two days and have an 11-strong entourage travelling with them.
Arsenal complete move for Sampdoria midfielder Lucas Torreira
It is unclear when Torreira will report for pre-season with Arsenal as until recently he was in action at the World Cup. Arsenal have completed the signing of Sampdoria and Uruguay midfielder Lucas Torreira for a fee in the region of £26m.
Meghan Markle and Taoiseach Leo Varadkar at Government Buildings.
Lincolnshire's RAF Red Arrows and the Battle of Britain Memorial Flight Lancaster will fly over Buckingham Palace for the flypast at 1pm.
DOMINIC LIPINSKI/PA WIRE/PA IMAGES The family at Prince Louis' christening on July 9.
The RAF, which is the first-ever independent air force, split from the British Army and Royal Navy in April 1918.
The Queen presents a new Queen's colour to the RAF at Buckingham Palace.
France and Belgium battle for place in World Cup final
Vertonghen is an experienced campaigner and seen as one of Belgium's most dependable players. "It is a hard situation for him". But if Belgium wins it will be Henry who will profit in his role as an assistant coach to manager Roberto Martinez.