Britain's Queen Elizabeth II waves from her seat in the 1902 State Landau coach next to Camilla, Duchess of Cornwall, during the procession from Westminster Hall to Buckingham Palace to celebrate the final day of the Queen's Diamond Jubilee in London on Tuesday. Glyn Kirk, Pool, AFP / Getty Images Queen Elizabeth II travels by carriage along Parliament Street to Buckingham Palace on Tuesday. Matthew Lloyd, WPA Pool / Getty Images Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge ride towards Buckingham Palace in a royal procession on the fourth and final day of the Queen's Jubilee. Sean Gallup / Getty Images A service of thanksgiving to mark Queen Elizabeth II's Diamond Jubilee at St Paul's Cathedral on Tuesday. Murray Sanders, WPA Pool / Getty Images From left to right: Prince Harry, Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Camilla, Duchess of Cornwall, Prince Charles and Queen Elizabeth II during a service of thanksgiving at St Paul's Cathedral. Murray Sanders, WPA Pool / Getty Images A choir performs during the service of thanksgiving at St. Paul's Cathedral. Tim Ireland, WPA Pool / Getty Images Britain's Queen Elizabeth II and members of the royal family leave St Paul's Cathedral following the service of Thanksgiving. Jeff J Mitchell, Pool, AFP / Getty Images Fireworks light up the stage at the end of the Queen's Diamond Jubilee Concert at Buckingham Palace in London on Monday. Leon Neal, AFP / Getty Images Prince Charles kisses the hand of his mother, Queen Elizabeth II, on stage as British singers Paul McCartney and Elton John and other performers look on after the Jubilee concert at Buckingham Palace. Leon Neal, AFP / Getty Images British singer Sir Paul McCartney performs on stage during the Queen's Diamond Jubilee Concert at Buckingham Palace. Leon Neal, AFP / Getty Images Elton John performs during the Queen's Diamond Jubilee Concert at Buckingham Palace. Leon Neal, AFP / Getty Images A boy gets a boost to watch the Diamond Jubilee Concert at Buckingham Palace in London on June 4. The star-studded performance 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 British singer-songwriter Robbie Williams performs during the Diamond Jubilee Concert at Buckingham Palace. Leon Neal, AFP / Getty Images Australian singer Kylie Minogue performs during the Diamond Jubilee Concert. Leon Neal, AFP / Getty Images Britain's Queen Elizabeth II watches the Diamond Jubilee concert alone after her husband, Prince Philip, was hospitalized with a bladder infection. Dave Thompson, Pool / AP Photo The Duke and Duchess of Cambridge watch the concert with Prince Harry, right, and Princess Beatrice, far left. Dave Thompson, Pool / AP Photo Queen Elizabeth II, center left, and Prince Philip, center right, with other members of the royal family watch the celebration from onboard the royal barge during the Diamond Jubilee Pageant on the River Thames. John Stillwell, Pool / Getty Images Hundreds of boats row along the River Thames in celebration of the Diamond Jubilee Pageant. Kerim Otken, EPA / Landov Twins Olivia (left) and Hatty Hardy (right), watch the royal pageant with their mother Rose (bottom) near Blackfriars bridge in London. Matthew Lloyd / Getty Images Members of Her Majesty's Royal Marine Band, Plymouth, play in the pouring rain. Dan Kitwood, WPA Pool / Getty Images Spectators watch the Diamond Jubilee celebration an apartment building. Dan Kitwood / Getty Images Britain’s royal family (from left): Kate, Duchess of Cambridge; Prince Philip; Camilla, Duchess of Cornwall; Prince Charles; Queen Elizabeth; Prince William; and Prince Harry on the royal barge to celebrate the queen’s Diamond Jubilee in London on Sunday. Matt Dunham, Pool / AP Photo Queen Elizabeth II is greeted by Chelsea pensioners at Chelsea Pier. Bethany Clarke, WPA Pool / Getty Images The Duke and Duchess of Cambridge and Prince Harry prepare to board the Spirit of Chartwell, where they joined the queen. Stefan Rousseau, PA Photo / Landov Kate, Duchess of Cambridge, and Camilla, Duchess of Cornwall, share a laugh aboard the Spirit of Chartwell. Stefan Rousseau, Pool / AP Photo The queen walks down the gangway to her launch. Harry Engels / Getty Images Pleasure boats of all shapes and sizes muster on the River Thames, in celebration of the queen’s Diamond Jubilee, near Putney Bridge in London. Kevin Coombs, Reuters / Landov The queen’s launch makes its way down the river. Harry Engels / Getty Images Spectators line the embankment of the Thames to watch the flotilla. Harry Engels / Getty Images Charlie Gilkes, Michael Middleton, Pippa Middleton and James Middleton wave from a boat during the Diamond Jubilee pageant. Chris Jackson / Getty Images London Mayor Boris Johnson waves a Queen Jubilee flag on the River Thames. Andy Rain, EPA / Landov Princess Eugenie (right) and Princess Beatrice visit a Big Jubilee Lunch at the All Saints church in the Fulham section of London Sunday as part of the Diamond Jubilee celebrations. Matt Grayson / AP Photo Princess Anne arrives at Chelsea Pier. Bethany Clarke, WPA Pool / Getty Images Britain's Prince Charles and his wife Camilla, Duchess of Cornwall share a laugh during their visit to the Big Jubilee Lunch in Piccadilly Square. Bogdan Maran, EPA / Landov Spectators wait for the start of the pageant along the River Thames. Andrew Winning, Reuters / Landov Jubilee revelers shelter from the rain as they wait on the riverbank ahead of the Diamond Jubilee River Pageant. Matt Cardy / Getty Images