Royal gun salutes took place in London and Edinburgh (Picture: British Army).
The King's Troop Royal Horse Artillery have performed a 41 Gun Royal Salute in Hyde Park, to mark the Queen's 93rd birthday.
They made the journey with their horses and carriages past Buckingham Palace before heading towards Hyde Park.
A 62-gun salute by the Honourable Artillery Company also took place at the Tower of London.
A further gun salute was held at Edinburgh Castle.
The Royal Regiment of Scotland also mounted their first Queen's Guard at Buckingham Palace.
At the Tower of London, a total of 62 rounds are fired on Royal anniversaries.
Gun salutes would customarily be performed with just 21 rounds but because the Tower of London is a Royal Palace, a further 20 rounds are fired, with a further 21 fired for the City of London.
It is believed the Tower holds the record for the most rounds fired in a single salute.
The annual commemorations are being held today to mark the Queen's actual birthday on 22 April, which fell on Easter Sunday this year, but gun salutes are never held on a Sunday.
Trooping the Colour marks Her Majesty's official birthday in a few weeks time, usually held on the second Saturday of June.