Revelers on the Mall in London watch Britain Queen Elizabeth II appear on the Buckingham Palace balcony as part of a four-day Diamond Jubilee celebration to mark the 60th anniversary of Queen Elizabeth II accession to the throne. (Sang Tan/Associated Press) #

A woman in a fancy dress hat featuring Queen Elizabeth II and a corgi waits for the start of the Diamond Jubilee, Buckingham Palace Concert on June 4 in London, England. For only the second time in it's history, the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. (Dominic Lipinski/WPA Pool) #

People attend a street party to celebrate Queen Elizabeth II Diamond Jubilee at Primrose Hill in London on June 2. (Suzanne Plunkett/Reuters) #

Garrison Sergeant Major Bill Mott shouts three cheers for the Queen as the Royal flotilla passes during the Diamond Jubilee Pageant on the River Thames in London on June 3. Britain's Queen Elizabeth joined an armada of 1,000 boats down London's River Thames to the pealing of bells on Sunday in a spectacular highlight of four days of nationwide celebrations to mark her 60th year on the throne. (Reuters) #

A racegoer waves a Union Jack flag next to a cardboard cut-out of Queen Elizabeth II on an open-top bus at the Epsom Derby festival in Epsom, southwest of London on June 2. Queen Elizabeth gets four days of celebrations to mark her 60 years on the British throne under way on Saturday with one of her favorite pastimes, a trip to the horse races, as tributes to the long-serving monarch pour in. (Toby Melville/Reuters) #

Britain's Queen Elizabeth II and Prince Philip wave from a boat during a pageant in celebration of the Queen's Diamond Jubilee along the River Thames in central London on June 3. (Andrew Winning/Reuters) #

A general view of the Diamond Jubilee Thames River Pageant led by the rowbarge Gloriana towards Tower Bridge ahead of the manpowered section on June 3 in London, England. (Owen Humphreys/WPA Pool) #

Britain's Royal Family (from left) Kate, Duchess of Cambridge, Prince Philip, Camilla, Duchess of Cornwall, Prince Charles, Queen Elizabeth II, Prince William and Prince Harry on the royal barge, the principal boat of a flotilla of 1,000 vessels, on the River Thames, during a river pageant to celebrate the Queen's Diamond Jubilee in London on June 3. An armada of vessels, from historic sailboats and barges to kayaks, lifeboats and military launches, took part in Sunday's river pageant to mark the queen's 60 years on the throne. (Matt Dunham/Associated Press) #

People wave from a building on the river bank as a flotilla of 1,000 vessels passes on the River Thames, during a river pageant to celebrate Britain's Queen Elizabeth II's Diamond Jubilee in London. (Matt Dunham/Associated Press) #

Britain's Queen Elizabeth II shakes hands with a racegoer as Prince Philip, Duke of Edinburgh (second left) and Lord Lieutenant of Surrey Sarah Goad, (center behind) follow at the Epsom Derby, Epsom, southern England on June 2 the first day of the Queen's Diamond Jubilee celebrations. (Ben Stansall/Pool via Associated Press) #

Members of the Red Devils aerobatics team parachute on the course at the start of Derby Day, the second day of the Epsom Derby horse racing festival, at Epsom in Surrey, southern England, on June 2 the first official day of Britain's Queen Elizabeth II's Diamond Jubilee celebrations. (Ben Stansall/AFP/Getty Images) #

Britain's Queen Elizabeth II smiles after the Derby horse race at the Epsom Derby festival in Epsom, southwest of London on June 2. (Toby Melville/Reuters) #

Royal fan William Wallace poses for a photograph in London on June 2. The Queen gets four days of celebrations to mark her 60 years on the British throne. (Stefan Wermuth/Reuters) #

Joshua (8) poses for a picture during a Jubilee Family Festival in Hyde Park, central London on June 2. (Stefan Wermuth/Reuters) #

A Royal supporter wearing Union Jack glasses poses on the Mall outside Buckingham Palace in London on June 4 in preparation for the Queen's Jubilee concert. A chain of more than 4,200 beacons began to flare across the globe on June 4 to mark Queen Elizabeth II's Diamond Jubilee, with the last to be lit by the monarch at a star-studded concert at Buckingham Palace. (Ben Stansall/AFP/Getty Images) #

Britain's Catherine, Duchess of Cambridge, waves from the royal barge 'Spirit of Chartwell' during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3. Queen Elizabeth II sailed Sunday on a royal barge at the center of a spectacular 1,000-boat river pageant on the Thames. (Dylan Martinez/Pool via AFP/Getty Images) #

A man holds a flag as crowds line Parliament Street to watch the Royal Motorcade passing by on June 5 in London, England. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. (Kevin Coombs/WPA Pool) #

Britain's Queen Elizabeth II arrives at Chelsea Pier in London, before boarding the royal barge to participate in the Diamond Jubilee River Pageant on June 3. (Bethany Clarke/Pool via Associated Press) #

Guards arrive at Buckingham Palace ahead of a horse-drawn carriage procession carrying Queen Elizabeth II and the royal family in London on June 5. Cheering crowds thronged the streets of London on Tuesday for the grand finale to four days of festivities marking Queen Elizabeth's Diamond Jubilee attended by millions across Britain. (Cathal McNaughton/Reuters) #

Catherine, Duchess of Cambridge meets well-wishers before boarding the royal barge 'Spirit of Chartwell' for the Thames Diamond Jubilee Pageant on the River Thames in London on June 3. Hundreds of rowing boats, barges and steamers filled the River Thames with a blaze of color on Sunday as Queen Elizabeth II sailed through London as part of her spectacular diamond jubilee pageant. (Stefan Rousseau/Pool via AFP/Getty Images) #

Royalist supporters pose for pictures with Britain's Union flag wellington boots as they gather along the River Thames in London on June 3. (Carl Court/AFP/Getty Images) #

Three year old Henry Skelton waves his Union flag during the river pageant to celebrate the Queen's Diamond Jubilee as it passes St Paul's Cathedral in London on June 3. (Luke MacGregor/Reuters) #

A man has his face painted with Britain's Union flag on the Mall outside Buckingham Palace in London, on June 4 in preparation for the Queen's Jubilee concert. (Adrian Dennis/AFP/Getty Images) #

Freya Smith (4) covers her face with a flag as she poses for a picture during a Jubilee Family Festival in Hyde Park, central London on June 2. (Stefan Wermuth/Reuters) #

Mandy Ellis wears a hat decorated with Union flags as she looks towards the London Eye on June 2. (Luke MacGregor/Reuters) #

Britain's Queen Elizabeth II walks in the parade ring before the Diamond Jubilee Coronation Cup on Derby Day, the second day of the Epsom Derby horse racing festival, at Epsom in Surrey, southern England on June 2 the first official day of Britain's Queen Elizabeth II's Diamond Jubilee celebrations. (Adrian Dennis/AFP/Getty Images) #

Racegoers wear masks of members of the British royal family, (L-R) Kate, Duchess of Cambridge, Prince William, Queen Elizabeth II, Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall, as they wait for the action to start on Derby Day, the second day of the Epsom Derby horse racing festival, at Epsom in Surrey, southern England, on June 2. (Adrian Dennis/AFP/Getty Images) #

Diamond Jubilee revelers wave the Union Jack flag in the Mall during the entertainment at the Buckingham Palace Concert on June 4 in London, England. For only the second time in its history, the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. (Matt Cardy/Getty Images) #

The British Royal Air Force Red Arrows fly in formation over Buckingham Palace in London to celebrate Queen Elizabeth's Diamond Jubilee as the royal family stood on the balcony on June 5. (Peter Macdiarmid/Pool via Associated Press) #

Britain's Queen Elizabeth II accompanied by Prince Charles, 2nd left, Camilla, Duchess of Cornwall, left, Prince William, 2nd right and Kate Duchess of Cambridge watch a fly past as they appear on the balcony of Buckingham Palace in central London, on June 5 to conclude the four day Diamond Jubilee celebrations to mark the 60th anniversary of the Queen's accession to the throne. (Lefteris Pitarakis/Associated Press) #

Revelers enjoy the party atmosphere on the The Mall as thousands gather for The Diamond Jubilee Concert on June 4 in London, England. (Christopher Furlong/Getty Images) #

People wear the Union Jack flag on the Mall prior to the Diamond Jubilee Buckingham Palace Concert on June 4. (Gareth Cattermole/Getty Images) #

Britain's Queen Elizabeth II smiles as she leaves St Paul's Cathedral following a thanksgiving service to mark her Diamond Jubilee in central London on June 5. Four days of nationwide celebrations during which millions of people have turned out to mark the Queen's Diamond Jubilee conclude on Tuesday with a church service and carriage procession through central London. (ndrew Winning/Reuters) #

People pose wearing masks of Prince Charles, Prince of Wales and Queen Elizabeth II in St James's Park prior to the Diamond Jubilee Buckingham Palace Concert on June 4. (Gareth Cattermole/Getty Images) #

British singer-songwriter Robbie Williams performs on stage during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4 The star-studded musical extravaganza comes on the third of four days of celebrations to celebrate Queen Elizabeth II's 60 years on the throne. (Leon Neal/AFP/Getty Images) #

Spectators cheer with Britain's Union flags during the Queen's jubilee concert on the Mall outside Buckingham Palace in London on June 4. (Adrian Dennis/AFP/Getty Images) #

Singer Sir Elton John performs on stage during the Diamond Jubilee concert at Buckingham Palace on June 4 in London, England. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. Thousands of well-wishers from around the world have flocked to London to witness the spectacle of the weekend celebrations. (Dan Kitwood/Getty Images) #

People watch as the Jubilee national beacon is lighted up during the Diamond Jubilee concert in front of Buckingham Palace in London on June 4. #

Buckingham Palace is illuminated by a fireworks display during the Diamond Jubilee Concert in London on June 4. Britain's Queen Elizabeth II made a regal appearance at a star-studded diamond jubilee concert Monday but without her husband Prince Philip at her side after he was hospitalized hours earlier. ( David Parker/Pool via AFP/GettyImages) #

Britain's Queen Elizabeth II waves from her seat in the 1902 State Landau coach during the carriage procession from Westminster Hall to Buckingham Palace to celebrate the Queen's Diamond Jubilee in London on June 5. Britain's Queen Elizabeth II on wraps up four days of diamond jubilee celebrations and festivities will conclude with a ceremonial carriage procession in London, a formal contrast to the spectacular pop tribute staged outside Buckingham Palace the day before. (John MacDougall/AFP/Getty Images) #

A boy gets a boost to see the action from the Mall waiting for the start of the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4. The star-studded musical extravaganza comes on the third of four days of celebrations to celebrate Queen Elizabeth II's 60 years on the throne. (Leon Neal/AFP/Getty Images) #

Britain's Queen Elizabeth II waves from the royal barge 'Spirit of Chartwell' as it sails past the Houses of Parliament during the Thames during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3. Queen Elizabeth II was to sail on a ceremonial barge down the Thames on Sunday at the centre of a 1,000-boat pageant to mark her Diamond Jubilee. (John Stillwell/Pool via AFP/Getty Images) #

In this June 2, 1953 photo, Britain's Queen Elizabeth II, seated on the throne, receives the fealty of the Archbishop of Canterbury (back to camera at center) the Bishop of Durham (left) and the Bishop of Bath and Wells, during her coronation in Westminster Abbey, London. (Associated Press) #