South-east London and north Kent residents are all set to celebrate the Queen’s 90th birthday today (April 21).

Tributes will be paid to the monarch - born on April 21 1926 - who has become the country's first nonagenarian sovereign.

Well-wishers are expected to sing Happy Birthday to the Queen when she goes on a walkabout close to her Windsor Castle home later to acknowledge the good wishes of the public.

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The Prince of Wales is understood to be making a speech in tribute to his mother at the night-time event.

GALLERY - Queen’s 90th birthday: Can you spot yourself in these royal snaps taken across south east London and north Kent?

David Cameron will lead the nation in honouring the monarch's life when MPs debate a "humble address" to mark the Queen's birthday, proposed by the Prime Minister.

He is expected to say: "Throughout it all, as the sands of culture shift and the tides of politics ebb and flow, Her Majesty has been steadfast - a rock of strength for our nation, for our Commonwealth and on many occasions for the whole world."

The milestone birthday has been marked by the release of an historic photograph of the Queen surrounded by her five great-grandchildren - including Prince George and Princess Charlotte - and her two youngest grandchildren.

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The image is one of three taken by celebrity photographer Annie Leibovitz who has also captured the Queen informally with her only daughter the Princess Royal, and in the final image with four of her dogs, her corgis Willow and Holly and dorgis Vulcan and Candy.

One unusual tribute will see the Houses of Parliament lit up red, white and blue in honour of the Queen's milestone.

And traditional gun salutes will thunder across the capital when 41 volleys are fired by the King's Troop Royal Horse Artillery in London's Hyde Park, and 62 rounds by the Honourable Artillery Company close to the Tower of London - the extra 21 volleys for the citizens of the City of London to show their loyalty to the monarch.

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When the Queen became the nation's longest-reigning monarch last autumn - passing Queen Victoria's record - she remarked that living to a ripe old age can bring many anniversaries: ''Inevitably a long life can pass by many milestones. My own is no exception.''

And in her Christmas broadcast the Queen made a light-hearted remark about turning 90, hinting she was aware of the significance of the milestone: ''I am looking forward to a busy 2016, though I have been warned I may have Happy Birthday sung to me more than once or twice.''

During her 64-year reign the monarch has been served by 12 prime ministers from Sir Winston Churchill to David Cameron - Barack Obama, who will drop in for lunch on Friday, is the 12th US president to hold office over the same period.

A generous benefactor is funding a £200,000 bronze statue of the Queen - which is being built in Gravesend ahead of her official birthday which falls in June.

The sculpture is believed to be the first showing her seated, in full Order of the Garter robes. She will be larger than life and mounted on a stone plinth.

Are you doing anything to mark the Queen's birthday or have you ever met her? Email: fiona.simpson@london.newsquest.co.uk