Britain's Queen Elizabeth II addresses the country and Commonwealth on Tuesday, June 5, 2012, during her Diamond Jubilee celebration. The queen, in the two-minute message recorded the day before, said: "The events that I have attended to mark my Diamond Jubilee have been a humbling experience. It has touched me deeply to see so many thousands of families, neighbors and friends celebrating together in such a happy atmosphere." (AP Photo/ITN)
The Duchess of Cambridge (right), nee Kate Middleton, receives flowers from children after she and other members of the royal family attended Christmas services at St. Mary Magdelene Church on the grounds of Sandringham, Queen Elizabeth II's Norfolk retreat, in northeast England on Sunday, Dec. 25, 2011. (AP Photo/Lefteris Pitarakis)
ENERGY SAVER: Britain's Queen Elizabeth II reportedly turns off lights in unoccupied areas of the vast Buckingham Palace. Posted notices urge staff to do the same. There are no plans to rent out the palace, however.
President Obama and first lady Michelle Obama welcome Britain's Queen Elizabeth II and the Duke of Edinburgh at Winfield House, the residence of the Ambassador of the U.S., in Regent's Park, London. (Associated Press)
Britain's Queen Elizabeth II and Mr. Obama toast at a state banquet in London's Buckingham Palace on Tuesday. Mr. Obama brought gifts for the queen and other members of the British royal family. (Associated Press)
President Obama (second from right), first lady Michelle Obama (second from left), Britain's Queen Elizabeth II (right) and Prince Philip tour the Queen's Gallery at Buckingham Palace in London on Tuesday, May 24, 2011. (AP Photo/Charles Dharapak)
Britain's Queen Elizabeth II (second from left); President Obama; Camilla, Duchess of Cornwall, who is Prince Charles' wife; first lady Michelle Obama; and Prince Philip, the queen's husband, take part in the official welcome ceremony outside Buckingham Palace with a honor guard from the Scots Guards at the start of the president's state visit in London on Tuesday, May, 24, 2011. (AP Photo/Alastair Grant)
Queen Elizabeth II (second from right) and her husband, Prince Philip (right), greet President Obama and his wife, first lady Michelle Obama, upon the Obamas' arrival at Buckingham Palace in central London on Tuesday, May 24, 2011. (AP Photo/Toby Melville, Pool)
ASSOCIATED PRESS PHOTOGRAPHS
A protester is stopped by police in a street in Dublin on Tuesday during a demonstration against the first-ever visit to Ireland of Britain's Queen Elizabeth II. The Queen set foot on Irish soil at the start of a historic state visit that will herald a new era in relations between Britain and Ireland.
Britain's Queen Elizabeth II (right) is introduced to Enda Kenny (left), Ireland's taoiseach, or prime minister, by Irish President Mary McAleese at Aras An Uachtarain, the president's residence, in Phoenix Park in Dublin on Tuesday, May 17, 2011. The queen's visit is the first to the Republic of Ireland by a British monarch. (AP Photo/Tony Maxwell, Pool)
Mounted police patrol near Parliament in London on Monday, May 16, 2011, after British police received a bomb threat from a dissident Irish republican group ahead of Queen Elizabeth II's sensitive trip to Ireland on Tuesday. (AP Photo/Kirsty Wigglesworth)
Actor John Nettles holds the insignia of Officer of the British Empire (OBE) medal, after it was presented to him by Britain's Queen Elizabeth II, at an investiture at Buckingham Palace in London, Tuesday Nov. 9, 2010. Nettles, 67, the star of two long-running television series 'Bergerac' and 'Midsomer Murders', was awarded the honour for services to drama.(AP Photo/Stillwell, pool)
FILE - Britain's Queen Elizabeth II arrives at television studios, in Belfast, Northern Ireland, in this Oct. 21, 2010 file photo. Britain's Queen Elizabeth II is launching an official Facebook page, offering fans daily updates on her engagements, the royal household said Sunday Nov. 7, 2010. (AP Photo/Peter Morrison, File)
In this undated photo provided by Britain's Buckingham Palace Sunday, Nov. 7, 2010, Britain's Queen Elizabeth II's facebook page is seen. The 84-year-old British monarch will be featured in videos, photos and news items on the site, which will be available from Monday, alongside other members of the country's royal family, including Princes William and Harry. (AP Photo/Buckingham Palace, HO) NO SALES
Britain's Queen Elizabeth II and Pope Benedict XVI leave the Palace of Holyroodhouse in Edinburgh, Scotland, after a formal welcome Thursday, his first day of a four-day visit to the United Kingdom. The pope acknowledged that the Catholic Church failed to act quickly or decisively to deal with child molestations by priests.
Britain's Queen Elizabeth II talks with Pope Benedict XVI during an audience in the Morning Drawing Room at the Palace of Holyroodhouse in Edinburgh Thursday Sept. 16, 2010. The Pope is on a four-day visit to Britian. (AP Photo David Cheskin/Pool)