Princess Elizabeth was born April 21, 1926. She was the first daughter of Prince Albert and his wife, Elizabeth, who later became King George VI and Queen Elizabeth.
Princess Elizabeth had one sister, Princess Margaret, who was born in 1930. Here, the sisters are seen with their grandmother, Queen Mary.
Princess Elizabeth poses for a photo in 1943.
Princess Elizabeth and Prince Philip with Canadian Prime Minister Louis St. Laurent in 1951.
Princess Elizabeth and the Duke of Edinburgh take part in a square dance in 1951.
Queen Elizabeth II and her husband, Prince Philip, at the queen's coronation in 1953.
Queen Elizabeth II on a stage at Parliament Hill, Ottawa. Prime Minister John Diefenbaker stands behind and to the left.
Prince Charles introduces his mother, Queen Elizabeth II, to his school teachers and fellow pupils at Sports Day, Hill House School, West London, summer 1957.
Queen Elizabeth with President Dwight D. Eisenhower in 1959
Queen Elizabeth II in Quebec in 1967.
President Gerald R. Ford and Queen Elizabeth II dance during the State Dinner at the White House on July 17, 1976, in honor of the Queen and Prince Philip's visit to Washington, D.C.
President George H.W. Bush and first lady Barbara Bush arrive at Buckingham Palace where they are met by Queen Elizabeth and Prince Philip on June 1, 1989.
Members of the British Royal Family sit for an official portrait in the white drawing room at Windsor Castle after Prince William's confirmation in 1997.
Queen Elizabeth addresses Britain five days after the death of Diana, Princess of Wales, in 1997.
Queen Elizabeth and the Queen Mother, left, leave church following the morning service at the Saint Mary Magdalene church in Sandringham on Dec. 25, 1999.
Britain's royal family including (front row) Queen Elizabeth II, left, Prince Charles, center, and Prince Philip, right, along with (back row) Prince Wiliam, left, Prince Edward, second left, Prince Andrew, second right, and Prince Harry, right, show their respect during the funeral for the Queen Mother on April 9, 2002.
A girl curtsies as she meets Queen Elizabeth II.
Queen Elizabeth at a dinner.
Queen Elizabeth smiles.
Queen Elizabeth rides in one of the iconic royal carriages.
Queen Elizabeth II talks with horse breeder Sarah Farish, right, before the running of the 133rd Kentucky Derby at Churchill Downs in Louisville, Ky., May 5, 2007.
Queen Elizabeth and Prince Philip attend a service celebrating their diamond wedding anniversary in Westminster Abbey in London in 2007. Queen Elizabeth is the first reigning British monarch to celebrate a diamond wedding anniversary, which marks 60 years.
Queen Elizabeth addresses the United Nations General Assembly at the U.N. Headquarters in New York on July 6, 2010.
Queen Elizabeth visits ground zero on July 6, 2010, to lay a wreath in remembrance of those killed on Sept. 11, 2001.
Queen Elizabeth meets the cast of "The Chronicles of Narnia: The Voyage of the Dawn Treader" at the Royal Premiere in Leicester Square, central London, Nov. 30, 2010.
Britain's Queen Elizabeth is welcomed by the Right Reverend John Hall, Dean of Westminster as she arrives before the wedding of Britain's Prince William and Kate Middleton in central London April 29, 2011.
Queen Elizabeth and Prince Philip travel to Buckingham Palace in a Semi-State Landau, along the Procession Route, after the wedding of Prince William and Kate Middleton in Westminster Abbey, in central London April 29, 2011.
President Barack Obama and first lady Michelle Obama receive Queen Elizabeth II and Prince Philip prior to a dinner in the Queen's honor at Winfield House in London, England, May 25, 2011.
Britain's Queen Elizabeth watches a presentation during her visit to her grandson, Prince William, at RAF Valley, in 2011.
Queen Elizabeth II and her husband, Prince Philip, pose for the official royal photo celebrating the 60th anniversary of her accession to the throne.