Britain's Catherine, Duchess of Cambridg

Britain's Catherine, Duchess of Cambridge (L) and Prince William (R) stand together during a reception ahead of a sovereign's jubilee lunch hosted by Britain's Queen Elizabeth II in honour of her diamond jubilee at Windsor Castle on May 18, 2012. AFP PHOTO / POOL / ARTHUR EDWARDS (Photo credit should read ARTHUR EDWARDS/AFP/GettyImages)

Prince William prepares to board the roy

Prince William prepares to board the royal barge 'Spirit of Chartwell' during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. 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, although heavy rain threatened to spoil the party. AFP PHOTO / POOL / STEFAN ROUSSEAU (Photo credit should read STEFAN ROUSSEAU/AFP/GettyImages)

Queen Elizabeth II and Prince Philip, Du

Queen Elizabeth II and Prince Philip, Duke of Edinburgh, arrive at Chelsea Pier during the Diamond Jubilee river Pageant in London on June 3, 2012. Britain is celebrating the diamond jubilee of Queen Elizabeth II, marking 60 years on the throne during which she has set a number of landmarks. One million people are expected to line the river to see the extravaganza of steam boats and tugs, speed boats and historic vessels. AFP PHOTO POOL / BETHANY CLARKE (Photo credit should read BETHANY CLARKE/AFP/GettyImages)

Princess Beatrice (back L) and Princess

Princess Beatrice (back L) and Princess Eugenie (front) of York visit a Big Jubilee Lunch at All Saints Church, Fulham, as part of the Diamond Jubilee celebrations in London on June 3, 2012. Britain is celebrating the diamond jubilee of Queen Elizabeth II, marking 60 years on the throne during which she has set a number of landmarks. One million people are expected to line the river to see the extravaganza of steam boats and tugs, speed boats and historic vessels. AFP PHOTO POOL / MATT GRAYSON (Photo credit should read MATT GRAYSON/AFP/GettyImages)

Camilla, Duchess of Cornwall, arrives to

Camilla, Duchess of Cornwall, arrives to embark to join the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. 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, although heavy rain threatened to spoil the party. AFP PHOTO / POOL / BETHANY CLARKE (Photo credit should read Bethany Clarke/AFP/GettyImages)

Catherine, Duchess of Cambridge, arrives

Catherine, Duchess of Cambridge, arrives to board the royal barge 'Spirit of Chartwell' during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. 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, although heavy rain threatened to spoil the party. AFP PHOTO / POOL / DAVID CRUMP (Photo credit should read DAVID CRUMP/AFP/GettyImages)

Britain's Queen Elizabeth II waves from

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, 2012. 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, although heavy rain threatened to spoil the party. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/GettyImages)

Britain's Queen Elizabeth (L) and Camill

Britain's Queen Elizabeth (L) and Camilla, Duchess of Cornwall, stand onboard the Spirit of Chartwell during the Thames Diamond Jubilee Pageant on the River Thames in ondon on June 3, 2012. Queen Elizabeth II was to sail on a ceremonial barge down the Thames at the centre of a 1,000-boat pageant to mark her diamond jubilee, although heavy rain threatened to spoil the party. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/GettyImages)

Pippa Middleton and James Middleton, the

Pippa Middleton and James Middleton, the sister and brother of Catherine, Duchess of Cambridge, ride on the royal barge 'Spirit of Chartwell' during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. 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, although heavy rain threatened to spoil the party. AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP/GettyImages)

Princess Beatrice of York waves to spect

Princess Beatrice of York waves to spectators from the deck of 'Havengore' during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. Queen Elizabeth II sailed Sunday on a royal barge at the centre of a spectacular 1,000-boat river pageant on the Thames, the set-piece of celebrations to mark her diamond jubilee. AFP PHOTO / POOL / LEON NEAL (Photo credit should read LEON NEAL/AFP/GettyImages)

The Duke of York and Princesses Beatrice

The Duke of York and Princesses Beatrice (L) and Eugenie and their father Prince Andrew, Duke of York, leave St Paul's Cathedral after National Service of Thanksgiving to celebrate the Queen?s Diamond Jubilee in London on June 5, 2012. Britain's Queen Elizabeth II 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. AFP PHOTO / IAN KINGTON (Photo credit should read IAN KINGTON/AFP/GettyImages)

Catherine, Duchess of Cambridge, arrives

Catherine, Duchess of Cambridge, arrives to board the Spirit of Chartwell during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. Queen Elizabeth II was to sail on a ceremonial barge down the Thames at the centre of a 1,000-boat pageant to mark her diamond jubilee, although heavy rain threatened to spoil the party. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/GettyImages)

Britain's Prince Charles, (L) and Camill

Britain's Prince Charles, (L) and Camilla, Duchess of Cornwall, arrive at Chelsea Pier to take part in the Diamond Jubilee Pageant on the River Thames in London, on June 3, 2012. Hundreds of rowing boats, barges and steamers filled the River Thames with a blaze of colour on Sunday as Queen Elizabeth II sailed through London as part of her spectacular diamond jubilee pageant. AFP PHOTO / Bethany Clarke/POOL (Photo credit should read Bethany Clarke/AFP/GettyImages)

British Prime Minister David Cameron (R)

British Prime Minister David Cameron (R) and his wife Samantha (L) leave St Paul's Cathedral after a national service of thanksgiving to celebrate the Queen?s Diamond Jubilee in London on June 5, 2012. Britain's Queen Elizabeth II 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. AFP PHOTO / POOL / KIERAN DOHERTY (Photo credit should read KIERAN DOHERTY/AFP/GettyImages)

Princess Beatrice of York boards 'Haveng

Princess Beatrice of York boards 'Havengore' during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. Queen Elizabeth II sailed Sunday on a royal barge at the centre of a spectacular 1,000-boat river pageant on the Thames, the set-piece of celebrations to mark her diamond jubilee. AFP PHOTO / POOL / LEON NEAL (Photo credit should read LEON NEAL/AFP/GettyImages)

Prince Charles and Camilla, Duchess of C

Prince Charles and Camilla, Duchess of Cornwall (C), and Catherine, Duchess of Cambridge, leave Westminster Hall after a Diamond Jubilee Luncheon for the carriage procession in London on June 5, 2012. 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. AFP PHOTO / POOL / PETER BYRNE (Photo credit should read PETER BYRNE/AFP/GettyImages)

Prince Edward, Duke of Kent (L) and Kath

Prince Edward, Duke of Kent (L) and Katharine, Duchess of Kent (R) leave St Paul's Cathedral after a national service of thanksgiving to celebrate the Queen?s Diamond Jubilee in London on June 5, 2012. Britain's Queen Elizabeth II 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. AFP PHOTO / IAN KINGTON (Photo credit should read IAN KINGTON/AFP/GettyImages)

Britain's Sophie, Countess of Wessex, le

Britain's Sophie, Countess of Wessex, leaves King Edward VII hospital after visiting her father in-law Prince Philip in London, on June 5, 2012. Queen Elizabeth II's husband Prince Philip, her stalwart companion through 60 years of rule, was absent from her side Tuesday as she marked the final day of her diamond jubilee with traditional pomp. AFP PHOTO / Andrew Cowie (Photo credit should read Andrew Cowie/AFP/GettyImages)

Britain's Queen Elizabeth II, waves from

STEFAN WERMUTH/AFP/GettyImages

Britain's Queen Elizabeth II, waves from the balcony at Buckingham Palace to celebrate the Queen's Diamond Jubilee in London on June 5, 2012. Britain's Queen Elizabeth II wraps up four days of diamond jubilee celebrations with a thanksgiving service and ceremonial carriage procession in London, a formal contrast to the spectacular pop tribute staged outside Buckingham Palace the day before. AFP PHOTO / POOL / STEFAN WERMUTH (Photo credit should read STEFAN WERMUTH/AFP/GettyImages)

Britain's Queen Elizabeth II leaves West

Britain's Queen Elizabeth II leaves Westminster Hall after a Diamond Jubilee lunch and beginning the return journey to Buckingham Palace in a carriage procession in London on June 5, 2012. Queen Elizabeth II attended the final day of celebrations for her diamond jubilee Tuesday, but the pomp and splendour were marred by the absence of her husband Prince Philip after he was hospitalised. AFP PHOTO / POOL / PETER BYRNE (Photo credit should read PETER BYRNE/AFP/GettyImages)

Britain's Catherine, Duchess of Cambridg

Britain's Catherine, Duchess of Cambridge, arrives at Westminster Hall for the Queen's Diamond Jubilee lunch before heading to Buckingham Palace in a carriage procession in London on June 5, 2012. Queen Elizabeth II attended the final day of celebrations for her diamond jubilee Tuesday, but the pomp and splendour were marred by the absence of her husband Prince Philip after he was hospitalised. AFP PHOTO / POOL / DAVID PARKER (Photo credit should read David Parker/AFP/GettyImages)

Britain's Queen Elizabeth II leaves the

Britain's Queen Elizabeth II leaves the hospital where her husband Prince Philip, Duke of Edinburgh, is being treated for a bladder infection in London on June 6, 2012. Queen Elizabeth II and Prince Andrew, Duke of York, visited Prince Philip on June 6 at the London hospital where he was taken two days ago with a bladder infection, forcing him to miss the Queen's final diamond jubilee celebrations. AFP PHOTO / CARL COURT (Photo credit should read CARL COURT/AFP/GettyImages)

Britain's Queen Elizabeth II (R) stands

Britain's Queen Elizabeth II (R) stands with members of the congregation including during a national service of thanksgiving for the Queen's Diamond Jubilee at St Paul's Cathedral in London on June 5, 2012. Queen Elizabeth II greeted 1.5 million cheering subjects from the balcony of Buckingham Palace on June 5 but faced the crowning moment of her diamond jubilee festivities without her ill husband Prince Philip. AFP PHOTO / POOL / SUZANNE PLUNKETT (Photo credit should read SUZANNE PLUNKETT/AFP/GettyImages)

Britain's Queen Elizabeth II waves to s

Britain's Queen Elizabeth II waves to spectators from her carriage as she leaves Westminster Hall after a Diamond Jubilee Luncheon in London on June 5, 2012. 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. AFP PHOTO / POOL / Kevin COOMBS (Photo credit should read Kevin COOMBS/AFP/GettyImages)

Britain's Queen Elizabeth II walks follo

Britain's Queen Elizabeth II walks followed by Commonwealth Secretary-General Kamalesh Sharma after a lunch with the heads of government and representatives of Commonwealth nations in central London on June 6, 2012. Queen Elizabeth II attended a Commonwealth luncheon in London following a grand four-day diamond jubilee celebration which was marred by the illness of her husband, Prince Philip. AFP PHOTO / POOL / LEFTERIS PITARAKIS (Photo credit should read LEFTERIS PITARAKIS/AFP/GettyImages)

Diamond Jubilee - Guildhall Reception

LONDON, ENGLAND - JUNE 05: Camilla, Duchess of Cornwall and Catherine, Duchess of Cambridge attend a Diamond Jubilee Reception at Guildhall on June 5, 2012 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 wellwishers from around the world have flocked to London to witness the spectacle of the weekend's celebrations. (Photo by Chris Jackson/WPA-PoolGetty Images)