Trooping the Colour parade marks Queen's official birthday

Prince Louis and his siblings joined other members of the Royal Family on the Buckingham Palace balcony

Getty Images Duke of Cambridge, Duchess of Cambridge and Prince Louis — Prince Louis and his siblings joined other members of the Royal Family on the Buckingham Palace balcony

The Queen's official birthday has been marked with the annual Trooping the Colour parade.

She was joined by members of her family and thousands of spectators to watch the display in Horse Guards Parade in Whitehall.

The Prince of Wales, the Duchess of Cornwall, the Duke and Duchess of Cambridge and the Duke and Duchess of Sussex all attended.

The Queen celebrated her 93rd birthday in April.

The Queen and other royals gathered to witness the Red Arrows perform a flypast for the Trooping the Colour parade

Reuters The Queen and other family members gathered to witness the Red Arrows perform a flypast — The Queen and other royals gathered to witness the Red Arrows perform a flypast for the Trooping the Colour parade

The royal colonels - the Prince of Wales, colonel of the Welsh Guards, the Princess Royal, colonel of the Blues and Royals, the Duke of Cambridge, colonel of the Irish Guards and the Duke of York, colonel of the Grenadier Guards - all rode on horseback as part of the parade.

The Duchess of Sussex made her first appearance in public since giving birth to her son Archie four weeks ago.

Prince Louis, carried by his mother Catherine alongside his father and siblings, waved at the planes as they flew by

Reuters The Duke and Duchess of Cambridge with their three children — Prince Louis, carried by his mother Catherine alongside his father and siblings, waved at the planes as they flew by

Meghan made her first appearance in public since the birth of her son, alongside Prince Harry

Danieal Leal-Olivas/AFP/Getty Images Meghan and Prince Harry arriving at Trooping the Colour — Meghan made her first appearance in public since the birth of her son, alongside Prince Harry

The Duchess of Cambridge was sitting opposite Meghan in the carriage

Daniel Leal-Olivas/AFP/Getty Images The Duchess of Cambridge at Trooping the Colour — The Duchess of Cambridge was sitting opposite Meghan in the carriage

Prince William rode on horseback as part of the parade

Victoria Jones/PA Wire The Duke of Cambridge rides on horseback to Horse Guards Parade — Prince William rode on horseback as part of the parade

Prince Louis and Princess Charlotte watched proceedings from inside Buckingham Palace before joining their parents on the balcony

Daniel Leal-Olivas/AFP/Getty Images Prince Louis and Princess Charlotte peer out of the windows of Buckingham Palace during the Trooping the Colour parade — Prince Louis and Princess Charlotte watched proceedings from inside Buckingham Palace before joining their parents on the balcony

Getty Images Members of the Welsh Guards, a regiment of Household Division, march to Horseguards parade during Trooping The Colour

Tolga Akmen/AFP/Getty Images The Queen at Trooping the Colour in a horse-drawn carriage

The Duke of Edinburgh, who celebrates his 98th birthday on Monday, has retired from official public duties and did not attend.

The Queen watched the ceremony - which this year parades the flag from the 1st Battalion Grenadier Guards - from a dais in Horse Guards Parade and she also inspected the lines of guardsmen.

Among the guests was Theresa May, who formally stepped down as Conservative party leader on Friday, but will remain in office until a successor has been appointed.

One soldier, Major Niall Hall, of the Regimental Adjutant of the Irish Guards, was thrown from his horse during the parade.

A spokesperson for the Ministry of Defence said Maj Hall was immediately treated by a medical team and taken to hospital. His injuries are not life-threatening.