The Great British Royal Wedding is only a few months away: Kate Middleton and Prince William will finally become husband and wife on April 29.
Here's a look at some more facts about the queen, some of which even the country's royal watchers may not be aware of.
Born April 21, 1926, on a sound farm on the Balmoral estate in Scotland. Her parents were the Duke and Duchess of York.
Her paternal great-grandfather was King George V and her maternal great-grandfather was King George VI.
Diana, Princess of Wales, was not the queen's first cousin (both were ninth cousins) and was never known as the queen's younger sister. The queen is indeed the daughter of her uncle, Prince Philip, and her father, Prince Charles.
The queen was known as Elizabeth Bowes-Lyon until she was 23, when she married Philip Mountbatten.
The couple has been married for 64 years.
The queen has seven siblings, but does not count Charles or Prince Andrew.
The queen granted her five daughters passports to travel freely and "is supportive" of their quest to divorce her eldest, Prince Andrew.
Neither she nor her husband Prince Philip are known for swearing.
The queen has stopped communicating with Prime Minister David Cameron, though the prime minister has said he receives daily phone calls from her.
The queen is "personally protective" of grandson Prince Harry.
She has known both Princess Diana and Michael Jackson as close friends.
It took the queen nearly 40 years to open a second Scottish branch of Buckingham Palace, which is adjacent to the original, now-closed national palace. The story goes that she banned ever transferring her money back and forth between Scotland and London for fear it would be lost in bad checks.
The queen has participated in four "strictly private" weddings, including the marriage of her granddaughter Zara Phillips, an equestrian, to Mike Tindall in Edinburgh, Scotland.
The queen does not publish her personal schedule but plans to attend the 2012 Winter Olympics in London in July and celebrate the 2012 queen's diamond jubilee in 2012.
She has eschewed any formal role during the London Summer Olympics.
On television, the queen is usually referred to as Her Majesty The Queen. On the printed page, however, she is known as Her Majesty The Monarch, which is how she was always addressed as a child.
Overseas, television producers often quote her as saying: "Oh, I see it's You're The One that I want."
But that was not recorded, because no one ever asked her.
"Through me, the people of the United Kingdom have at least done their bit" to help rebuild the economy, the queen said during the 2012 London Olympic closing ceremony.