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  • Queen Elizabeth and philanthropist Frederick Koch flick switches simultaneously to turn on a commemorative plaque at the Swan Theatre in Stratford-Upon-Avon, England on Nov. 13, 1986.Reuters
  • Queen Elizabeth II and Prime Minister of the Federal State of Brandenburg Manfred Stolpe take a ride in a horse carriage on Oct. 23, 1992Reuters
  • Queen Elizabth II (R) stands next to her mother Queen Elizabeth, the Queen Mother, as she waves to her well-wishers on her 93rd birthday on Aug. 4, 1993.Reuters
  • Queen Elizabeth II visits a craft exposition in Sta Mission, a town founded by anglicans missionaries over Kanuni Creek river on Feb. 20, 1994.Reuters
  • Britain's Queen Elizabeth II chats with an auid in the Natal Society for the Blind during her visit to South Africa in March, 1995.Reuters
  • Queen Elizabeth II and Prince Philip attend the Beating the Retreat ceremony on Horseguards Parade on June 13, 1996.Reuters
  • Queen Elizabeth and Prince Philip at the House of Lords at the State Opening of Parliament on May 14, 1997.Reuters
  • Prince Charles kisses his mother Queen Elizabeth's hand in front of Buckingham Palace on June 4, 2012.Reuters
  • Queen Elizabeth II holds a bottle of beer during her visit to the historical Bridge Inn in Topsham, Devon on March 27, 1998.Reuters
  • Britain's Queen Elizabeth II (L) greets Queen Margrethe of Denmark with a kiss, upon her arrival at Windsor Castle Feb.16, 2000.Reuters
  • Queen Elizabeth II animatedly talks to artistic director Christopher Bruce (R) and executive director Christopher Nourse (L) of Rambert Dance Company in west London on May 9, 2001.Reuters
  • Queen Elizabeth II waves to the crowds as she leaves the Salvation Army's Booth House in London on Feb. 12, 2002Reuters
  • Queen Elizabeth II records her Christmas Day message to the Commonwealth at Combermere Barracks in Windsor on Dec. 8, 2003.Reuters
  • Queen Elizabeth and Prince Philip at the House of Lords at the State Opening of Parliament on Nov. 23, 2004.Reuters
  • Queen Elizabeth II leaves St Mary Magdalene's church after the Royal Family's Christmas Day service on the Sandringham estate in Norfolk on Dec. 25, 2005Reuters
  • Queen Elizabeth II (C) smiles at Prince William (R) during the Sovereign's Parade at the Royal Military Academy in Sandhurst, southern England on Dec.15, 2006.Reuters
  • Britain's Queen Elizabeth wears the Imperial State Crown during the State Opening of Parliament, London, Britain on Nov. 6, 2007Reuters
  • Britain's Queen Elizabeth leaves Buckingham Palace by carriage for the State Opening of Parliament, in central London on Dec. 3, 2008.Reuters
  • Britain's Queen Elizabeth attends a cultural presentation at the Queen's hall as part of the Commonwealth Heads of Government Meeting in Port-of-Spain on Nov. 28, 2009.Reuters
  • Queen Elizabeth and Camilla, Duchess of Cornwall, leave after a Christmas Day service at St Mary Magdalene Church on the Royal estate at Sandringham, Norfolk, in east England on Dec. 25, 2010.Reuters
  • Queen Elizabeth meets High Court judges as she officially opens the Rolls Building, the latest addition to the Royal Courts of Justice, in central London on Dec. 7, 2011Reuters
  • Prince Philip, Queen Elizabeth and Prince Charles cheer during the Braemar Gathering in Braemar, Scotland on Sept. 1, 2012Reuters
  • Queen Elizabeth watches boxing training during a visit to The Factory Youth Zone in Manchester, northern England on Nov.14, 2013.Reuters
  • Queen Elizabeth looks at the Iron Throne as she meets members of the cast on the set of "Game of Thrones" on June 24, 2014.Reuters
  • Queen Elizabeth smiles as she attends a dinner at the Corinthia Palace Hotel in Attard, Malta on Nov. 27, 2015.Reuters
  • Britain's Queen Elizabeth II poses with her five great-grandchildren and her two youngest grandchildren in the Green Drawing Room, part of Windsor Castle's semi-State apartments. The children are: James, Viscount Severn (left), 8, and Lady Louise (second left), 12, the children of The Earl and Countess of Wessex; Mia Tindall (holding The Queen's handbag), the two year-old-daughter of Zara and Mike Tindall; Savannah (third right), 5, and Isla Phillips (right), 3, daughters of The Queen's eldest grandson Peter Phillips and his wife Autumn; Prince George (second right), 2, and in The Queen's arms and in the tradition of Royal portraiture, the youngest great-grandchild, Princess Charlotte (11 months), children of The Duke and Duchess of Cambridge, in this official photograph, released by Buckingham Palace to mark her 90th birthday April 20, 2016Reuters

Queen Elizabeth II, the Queen of the United Kingdom, Canada, Australia, and New Zealand, and the Head of the Commonwealth, celebrates her 90th birthday on Thursday, April 21, 2016. England has been celebrating the big day since the beginning of the month, and it is expected to continue till the end of June.

The Royal Mint even produced a commemorative £5 coin to mark the special occasion. The coin, designed by sculptor Christopher Hobbs, features a garland of roses, tipping the hat to the Queen's love for flowers. You can purchase the coin from The Royal Mint website for £20, but they are limited to three per household.

The Queen herself will celebrate her 90th birthday at Windsor Castle, where she will unveil a plaque. It will mark the start of a four-mile Queen's Walkway, reports the Telegraph. The walkway will reportedly connect 63 points of interest in London, thereby recognising the Queen's long-lasting monarchy, which has lasted over 63 years.

Also Read: Here is what the royal couple did during week-long trip

Following the unveiling, the Queen and Duke of Edinburgh will go on a walkabout to meet members of public, many of whom have camped overnight to get a glimpse of their Queen. In the evening, she will light the first of 1,000 beacons spread across the country to celebrate her birthday.

Queen Elizabeth will also have a private celebration at Windsor Castle in the evening, which will be attended by the Duke and Duchess of Cambridge. Many loyal fans of the royals will know that Prince William and Kate Middleton have already celebrated the Queen's 90th birthday once at the British High Commissioner's office in New Delhi during their recent India tour.

A series of three photographs of the Queen was also released in celebration of her birthday. One of them showed the matriarch surrounded by her two grandchildren and five great-grandchildren, including Prince George and Princess Charlotte.

In celebration of her birthday, we have compiled a few of Queen Elizabeth's photographs over the years. Check them out in the slide-show above.

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