Dressed in a vivid lime green coat and matching hat, the Queen was escorted down the Mall in a horse-drawn carriage to the ceremony at Horse Guards Parade on the her official 90th birthday.
She celebrates two birthdays every year - her actual birthday on 21 April, and her official birthday held on a Saturday in June - in a tradition going back 250 years to try to ensure better weather for the monarch's official celebrations.
On Friday a national service of thanksgiving was held at St Paul's Cathedral paying tribute to the Queen's "faithful devotion" to the country.
Archbishop of Canterbury Justin Welby said the Queen had reigned through "war and hardship, turmoil and change".
She celebrates two birthdays every year - her actual birthday on 21 April, and her official birthday held on a Saturday in June - in a tradition going back 250 years to try to ensure better weather for the monarch's official celebrations.
On Friday a national service of thanksgiving was held at St Paul's Cathedral paying tribute to the Queen's "faithful devotion" to the country.
Archbishop of Canterbury Justin Welby said the Queen had reigned through "war and hardship, turmoil and change".