Britain's Queen Elizabeth II becomes the longest serving British monarch on September 9, 2015, surpassing the record set by her great-great-grandmother Queen Victoria with more than 63 years on the throne. Now 89-years-old, Elizabeth is also the country's oldest ever monarch.
Here, then Princess Elizabeth, is introduced by her mother Elizabeth, the Duchess of York, to disabled soldiers at an exhibition of their work in London, May 16, 1933.
Queen Elizabeth II, then Princess Elizabeth, center, waves as she stands on the balcony of Buckingham Palace in London with her grandparents King George V and Queen Mary, May 6, 1935. Her sister, Princess Margaret, is just visible over the balcony edge.
Queen Elizabeth II, then Princess Elizabeth, and her companion Shaun Plunket take the penguins for a walk at London Zoo, June 30, 1938.
Queen Elizabeth II, then Princess Elizabeth, right, and her sister, Princess Margaret, in their Girl Guide uniforms, practice their bandaging skills, August 1943. Princess Elizabeth is wearing the badge of the swallow patrol and two white stripes, which indicates that she is patrol leader.
Queen Elizabeth II, then Princess Elizabeth, right, enjoys a joke with her father, King George VI, in the grounds of the Royal Lodge in Windsor, England, August 20, 1946.
Queen Elizabeth II, then Princess Elizabeth, sits in Natal National Park, South Africa on her 21st birthday, April 21, 1947. In the background are the Drakenberg Mountains.
Queen Elizabeth II, then Princess Elizabeth, and her husband Prince Philip, the Duke of Edinburgh, wave to the crowd from the balcony of Buckingham Palace in London, after their wedding on November 20, 1947. From left to right, King George VI, Princess Margaret, Lady Mary Cambridge, the bride and bridegroom, Queen Elizabeth and Queen Mary.
Queen Elizabeth II, then Princess Elizabeth, wears a silver gown with a diamond tiara and pearl necklace on August 30, 1949.
Queen Elizabeth II, then Princess Elizabeth, front left, helps her daughter Princess Anne stand on a wall, watched by King George VI, behind left, Queen Elizabeth, right, and Princess Margaret at Balmoral Castle, Scotland, in August 1951.
Queen Elizabeth II, then Princess Elizabeth, stands with her husband Prince Philip, the Duke of Edinburgh, and their children, Prince Charles and Princess Anne, at Clarence House, the royal couple's London residence, in August 1951.
Queen Elizabeth II, left, stands with her grandmother, Queen Mary, center, and her mother, Queen Elizabeth, at the entrance to London's Westminster Hall as her father's coffin arrives to lie in state on February 11, 1952.
Upon the death of her father, Elizabeth ascended the throne at the age of 25 on February 6, 1952.
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Britain's Prince Philip, the Duke of Edinburgh, kneeling, places his hands between those of his wife, Queen Elizabeth II, as he swears homage, during her coronation ceremony in Westminster Abbey on June 2, 1953.
The coronation was postponed more than a year for an appropriate period of mourning for King George VI.
Queen Elizabeth II, wearing the Imperial Crown, carries the symbols of authority, the orb and the sceptre, as she leaves Westminster Abbey on June 2, 1953, at the end of her coronation ceremony.
Queen Elizabeth II, center, laughs with the Duke of Gloucester, left, while Princess Margaret smokes a cigarette in a long holder, behind, as they watch the Olympic horse trials at Badminton, Gloucestershire on April 23, 1953.
Queen Elizabeth II addresses a vast gathering of more than 250,000 people at the Ramlila Grounds, a huge public meeting place, outside the walls of Old Delhi, India on January 28, 1961.
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Queen Elizabeth II is seen during the State Opening of Parliament in London in April 1966.
Queen Elizabeth II receives congratulations from well-wishers during a brief walkabout in London on June 7, 1977.
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U.S. President Ronald Reagan, left, on Centennial, and Britain's Queen Elizabeth II, on Burmese, go horseback riding on the grounds of Windsor Castle, England on June 8, 1982.
Credit: AP Photo/Bob Daugherty
Queen Elizabeth II walks where few other visitors are allowed, among the famed terracotta warriors in Xian, China, on Oct. 16, 1986.
Credit: AP Photo/Peter Bregg
Queen Elizabeth II -- the Queen Mother -- with her daughters, The Queen (in blue) and Princess Margaret (left) and Prince Harry (youngest son of Diana Princess of Wales) on right with other members of the Royal family watch an honor guard in London, August 4, 1997.
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Queen Elizabeth II and Prince Philip, Duke of Edinburgh, look at the mass of floral tributes laid outside Buckingham Palace in memory of Diana, Princess of Wales, September 5, 1997.
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Queen Elizabeth II rides her horse in the grounds of Windsor Castle, April 2, 2002.
Credit: Dan Chung/Reuters
Queen Elizabeth II and Prince Charles walk behind the Queen Mother's coffin following her funeral at Westminster Abbey in central London, April 9, 2002.
Royal dignitaries and politicians from around the world gathered at Westminster Abbey to pay their respects to the Queen Mother who died March 30, aged 101.
Credit: Dan Chung/Reuters
Queen Elizabeth II waves from the Gold State Coach during Golden Jubilee procession, London, June 4, 2002.
Queen Elizabeth II watches as a swarm of bees encircle chairs on the lawn of Windsor Castle in Berkshire April 15, 2003.
The Queen was amused when a swarm of bees delayed proceedings during her review of the Grenedier Guards at Windsor.
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U.S. President George W. Bush and first lady Laura Bush stand with Britain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, for an official photo in the Music Room before the start of the State Banquet at Buckingham Palace in London on Nov. 19, 2003.
Queen Elizabeth II sits in the Regency Room at Buckingham Palace in London on April 19, 2006, as she looks at some of the cards which have been sent to her for her 80th birthday, which she celebrated two days later.
Credit: AP Photo/Fiona Hanson
Queen Elizabeth II smiles with Prince Harry during the Sovereign's Parade at the Royal Military Academy in Sandhurst, England, April 12, 2006.
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Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, walk at Broadlands in Romsey, southern England in 2007.
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Queen Elizabeth ll receives a bouquet of flowers during a walkabout outside Manchester Cathedral following the traditional Royal Maundy Service on April 5, 2007, in Manchester, England.
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President Barack Obama and First Lady Michelle Obama pose with Queen Elizabeth II during an audience at Buckingham Palace in London, April 1, 2009.
Credit: AP Photo/John Stillwell
Queen Elizabeth leaves after attending a service of commemoration to mark the end of combat operations in Iraq at St Paul's Cathedral, London in this October 9, 2009.
Credit: Luke MacGregor/Reuters
Queen Elizabeth II walks with her husband Prince Philip through the Royal Gallery after delivering her speech during the State Opening of Parliament at the Houses of Parliament in London, November 18, 2009.
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Queen Elizabeth II leaves Buckingham Palace in a horse drawn carriage to attend the State Opening of Parliament in London, May 25, 2010.
Credit: Suzanne Plunkett/Reuters
Queen Elizabeth II and Prince Philip, Duke of Edinburgh, attend the Royal Wedding of Prince William to Kate Middleton (now Catherine, Duchess of Cambridge) in London, April 29, 2011.
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Queen Elizabeth II accepts flowers from people crowding the banks for the Brisbane River after a river cruise in Brisbane, Australia, Octoer 24, 2011. The queen was on her first visit to Australia since 2006.
Credit: Jodie Richter/AP
Queen Elizabeth II and Prince Edward watch the winners enclosure after the Queen's horse lost in the Epsom Derby at Epsom Racecourse in southern England, June 4, 2011.
Credit: Suzanne Plunkett/Reuters
Catherine, Duchess of Cambridge (L) laughs as Queen Elizabeth gestures during a visit to Vernon Park in Nottingham, England, June 13, 2012.
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Britain's Queen Elizabeth leaves after the State Opening of Parliament at the Palace of Westminster in London, May 8, 2013.
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Members of the British royal family (L-R) Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Queen Elizabeth II, Prince Andrew, Duke of York, Prince Harry, and Catherine, Duchess of Cambridge, watch the fly-past on the balcony at Buckingham Palace following the Queen's Birthday parade, 'Trooping the Colour,' in central London on June 15, 2013.
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Britain's Queen Elizabeth II is pictured after recording her Christmas Day broadcast in the State Dining Room at Buckingham Palace in central London on December 10, 2014. She spent Christmas Day at her Sandringham estate in Norfolk, England.
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Queen Elizabeth II looks at a Corgi dog as television presenter Paul O'Grady (2nd R) smiles during the Queen's visit to Battersea Dogs & Cats Home in London, March 17, 2015.
Credit: Ben Stansall/pool/Reuters
Senior members of Britain's royal family stand on the balcony of Buckingham Palace in the annual Trooping of the Colour ceremony to celebrate the Queen's official birthday in central London, June 13, 2015.
Credit: Stefan Wermuth/Reuters
German Chancellor Angela Merkel and Britain's Queen Elizabeth smile as a robot waves during their visit at the Technical University of Berlin (TU Berlin) in Berlin, June 24, 2015.
Queen Elizabeth and the Duke of Edinburgh were on a three day state visit to Germany.
Credit: Michael Sohn/Pool /Reuters
Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Princess Charlotte of Cambridge and Prince George of Cambridge talk to Queen Elizabeth II, Prince Phillip, Duke of Cambridge and Camilla, Duchess of Cornwall arrive at the Church of St Mary Magdalene on the Sandringham Estate for the christening of Princess Charlotte of Cambridge on July 5, 2015 in King's Lynn, England.
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Queen Elizabeth II sits in her private audience room in Buckingham Palace next to one of her official red boxes in which she receives documents and papers from government officials in the United Kingdom and the Commonwealth in London on September 8, 2015 in a photo taken to mark the moment she becomes Britain's longest reigning monarch.