Queen's 90th birthday: How is her milestone being celebrated?

Britain's longest-serving monarch celebrated her 90th birthday on 21 April. A host of events are continuing to be held to mark the milestone.

June

A number of formal celebrations will be held in June, to mark the Queen's official birthday.

On 10 June she will attend a national service of thanksgiving, along with the Duke of Edinburgh, at St Paul's Cathedral in London.

The following day, on 11 June - the Queen's official birthday - the annual Trooping the Colour will be held on Horse Guards Parade.

The birthday parade will end with members of the Royal Family making their annual appearance on the balcony of Buckingham Palace, where they will see a flypast by the Royal Air Force.

On Sunday 12 June, the Queen will then host a street party for some 10,000 people at the Patron's Lunch - a celebration of her patronage of more than 600 organisations in the UK and around the Commonwealth.

An artist's impression of what The Mall will look like when it is used to hold a street party

The Mall, in St James's Park, will be lined with picnic tables for the street party, during which guests will enjoy a hamper-style lunch, organisers say.

The event will be the culmination of a weekend of national events, with the Duke of Edinburgh, Prince William and Prince Harry due to attend the party.

The majority of tickets - costing £150 - have been offered to guests from organisations the Queen is patron of, while 1,000 tickets were allocated in a public ballot.

Earlier in the year, the following events took place:

April

On Wednesday 20 April, the day before her birthday, the Queen carried out two official engagements, both in Windsor.

Together with the Duke of Edinburgh, she visited the town's Royal Mail delivery office to mark the 500th Anniversary of the postal service.

She also officially opened the new bandstand in Windsor's Alexandra Gardens.

The Queen spent her birthday, on Thursday 21 April, at Windsor Castle, and unveiled a plaque on the Queen's Walkway, which was opened last year.

The Queen then went a walkabout with the Duke of Edinburgh to meet members of the public.

Gun salutes were held at saluting stations across the UK, including at Hillsborough Castle, Cardiff Castle, and Edinburgh Castle.

And later on, Her Majesty lit the first in a chain of about 1,000 beacons across the UK and worldwide to mark her birthday.

Members of the Army cadet force took beacons to the top of the highest peaks of England, Scotland, Wales and Northern Ireland.

The following day, on 22 April, the Queen hosted US President Barack Obama at Windsor Castle for a private lunch.

May

The Queen's birthday celebrations continued with a major event in the private grounds of Windsor Castle, from 12-15 May.

It celebrated her "love" of horses and "deep involvement" with the Armed Forces, organisers said.

The Queen attended on the final evening, held in a purpose-built arena, used by the annual Royal Windsor Horse Show during the day.

The 25,000 tickets for the four-night event sold out within hours.