Prince William and Catherine Middleton attend a Christmas Spectacular

FAKENHAM, ENGLAND - DECEMBER 18: Prince William and finacee Catherine Middleton arrive for a Christmas reception in aid of the Teenager Cancer Trust at theThursford Collection on December 18, 2010 in Fakenham, England. (Photo by Chris Jackson/Getty Images)

Prince William and Kate Middleton visit Trearddur Bay RNLI Lifeboat Station

TREARDDUR, WALES - FEBRUARY 24: Kate Middleton and Prince William launch the new Hereford Endeavour lifeboat as they visit Trearddur Bay Lifeboat Station at Anglesey on February 24, 2011 in Trearddur, Wales. The newly engaged couple named the Trearddur Bay Lifeboat Station’s new Atlantic 85 inshore lifeboat the ‘Hereford Endeavour.’ The vessel was launched during the naming ceremony and the crew demonstrate some of her rescue capabilities. The country is gearing up for the much anticipated wedding of the couple scheduled to take place on April 29, 2011 at Westminster Abbey in London. (Photo by Phil Noble-WPA Pool/Getty Images)

Prince William And Kate Middleton Visit The University Of St Andrews

ST ANDREWS, SCOTLAND - FEBRUARY 25: Prince William and Kate Middleton visit the University of St Andrews on February 25, 2011 in St Andrews, Scotland. The couple returned to the University to launch a fundraising campaign for a new GBP 13 million scholarship and students support. The couple will marry in a much anticipated ceremony at Westminster Abbey on April 29th. (Photo by Jeff J Mitchell/Getty Images)

Prince William And Kate Middleton Visit Northern Ireland

BELFAST, NORTHERN IRELAND - MARCH 08: Kate Middleton and Prince William visit City Hall on March 8, 2011 in Belfast, Northern Ireland. The Royal Couple are visiting Northern Ireland as part of a tour of the Nation that a couple of weeks ago took them to St Andrews University in Scotland and Anglesey in North Wales to launch a lifeboat. This day-long trip to Ireland has been kept top secret due to security issues. They will marry on the 29th April at Westminster Abbey in a much anticipated ceremony. (Photo by Chris Jackson/Getty Images)

Prince William And Kate Middleton Visit Darwen

DARWEN, ENGLAND - APRIL 11: Kate Middleton and Prince William visit Whitton Park on April 11, 2011 in Darwen, England. With less than three weeks to go until the Royal Wedding Prince William and Kate Middleton are making one of their final public appearances. (Photo by Chris Jackson/Getty Images)

Prince William And Kate Middleton Visit Darwen

DARWEN, ENGLAND - APRIL 11: Kate Middleton and Prince William visit Whitton Park on April 11, 2011 in Darwen, England. With less than three weeks to go until the Royal Wedding Prince William and Kate Middleton are making one of their final public appearances. (Photo by Chris Jackson/Getty Images)

Prince William And Kate Middleton Visit Darwen

DARWEN, ENGLAND - APRIL 11: Kate Middleton and Prince William visit Whitton Park on April 11, 2011 in Darwen, England. With less than three weeks to go until the Royal Wedding Prince William and Kate Middleton are making one of their final public appearances. (Photo by Chris Jackson/Getty Images)

ARK 10th Anniversary Gala Dinner

LONDON, ENGLAND - JUNE 09: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at the ARK 10th Anniversary Gala Dinner at Perk's Field on June 9, 2011 in London, England. (Photo by Arthur Edwards - WPA/Getty Images)

The Duke And Dutchess Of Cambridge North American Royal Visit - Day 2

OTTAWA, ON - JULY 1: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend Canada Day Celebrations at Parliament Hill on day 2 of the Royal Couple's North American Tour on July 1, 2011 in Ottawa, Canada. The newly married Royal Couple are on the second day of their first joint overseas tour. Ottawa is the start of a 12 day visit to North America which will take in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple will be joining millions of Canadians in taking part in today's Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Mark Large - Pool/Getty Images)

The Duke And Duchess Of Cambridge Canadian Tour - Day 6

YELLOWKNIFE, NT - JULY 05: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive for an official welcome ceremony at the Somba K'e Civic Plaza on July 5, 2011 in Yellowknife, Canada. The newly married Royal Couple are on the sixth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Chris Jackson/Getty Images)

The Duke And Duchess Of Cambridge Canadian Tour - Day 6

YELLOWKNIFE, NT - JULY 05: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are presented with Hary Winston Diamond cufflinks and a brooch (in the shape of a polar bear) as they attend a session of Youth Parliament at the Legislative Assembly on July 5, 2011 in Yellowknife, Canada. The newly married Royal Couple are on the sixth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Chris Jackson-Pool/Getty Images)

The Duke And Duchess Of Cambridge Canadian Tour - Day 6

BLACHFORD LAKE, NT - JULY 5: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge wear the sweaters of the Canadian Rangers after being made honourary members on July 5, 2011 in Blatchford Lake, Northwest Territories, Canada. The newly married Royal Couple are on the sixth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Arthur Edwards - Pool/GettyImages)

The Duke And Duchess Of Cambridge Canadian Tour - Day 8

CALGARY, AB - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge watch a rodeo demonstration at a Government Reception at the BMO Centre on July 7, 2011 in Calgary, Canada. The newly married Royal Couple are on the eighth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Chris Jackson/Getty Images)

The Duke and Duchess of Cambridge Consul General Reception

LOS ANGELES, CA - JULY 08: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge look on during a private reception at the British Consul-General's residence on July 8, 2011 in Los Angeles, California. The newly married Royal couple are on a three day visit to Southern California. (Photo by Chris Pizzello - Pool/Getty Images)

The Duke and Duchess of Cambridge Attend A Polo Match for Foundation for Prince William & Prince Harry

SANTA BARBARA, CA - JULY 09: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge celebrate after Williams' team won the Foundation Polo Challenge at the Santa Barbara Racquet and Polo Club on July 9, 2011 in Santa Barbara, California. The event benefits the American Friends of the Foundation of Prince William and Prince Harry, a charity which supports disadvantaged children, conservation and sustainable development, veterans and military families. (Photo by Chris Jackson/Getty Images)

The Duke and Duchess of Cambridge Attend A Polo Match for Foundation for Prince William & Prince Harry

SANTA BARBARA, CA - JULY 09: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge celebrate after Williams' team won the Foundation Polo Challenge at the Santa Barbara Racquet and Polo Club on July 9, 2011 in Santa Barbara, California. The event benefits the American Friends of the Foundation of Prince William and Prince Harry, a charity which supports disadvantaged children, conservation and sustainable development, veterans and military families. (Photo by Chris Jackson/Getty Images)

Zara Phillips Marries Mike Tindall In Edinburgh

EDINBURGH, SCOTLAND - JULY 30: (L-R) Prince Harry, Catherine, Duchess of Cambridge, and Prince William, Duke of Cambridge leave the church after the Royal wedding of Zara Phillips and Mike Tindall at Canongate Kirk on July 30, 2011 in Edinburgh, Scotland. The Queen's granddaughter Zara Phillips will marry England rugby player Mike Tindall today at Canongate Kirk. Many royals are expected to attend including the Duke and Duchess of Cambridge. (Photo by Dylan Martinez - WPA Pool/Getty Images)

Diamond Jubilee - Reception At Guildhall

LONDON, ENGLAND - JUNE 05: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a 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 Pool /Getty Images)

2012 London Paralympics - Day 1 - Cycling - Track

LONDON, ENGLAND - AUGUST 30: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge share a joke as they clap whilst watching the track cycling on day 1 of the London 2012 Paralympic Games at the Velodrome on August 30, 2012 in London, England. (Photo by Chris Jackson/Getty Images)

The Duke And Duchess Of Cambridge Tour Southeast Asia - Day 3

SINGAPORE - SEPTEMBER 13: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Kranji War Memorial during their Diamond Jubilee tour on September 13, 2012 in Singapore. (Photo by Nicky Loh/Getty Images)

The Duke And Duchess Of Cambridge Diamond Jubilee Tour - Day 8

TUVALU - SEPTEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge dance with the ladies at the Vaiku Falekaupule for an entertainment programme on September 18, 2012 in Tuvalu. Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are on a Diamond Jubilee tour representing the Queen taking in Singapore, Malaysia, the Solomon Islands and Tuvalu. (Photo by Arthur Edwards - Pool/Getty Images)

The Duke And Duchess Of Cambridge Make An Official Visit To Cambridge

CAMBRIDGE, UNITED KINGDOM - NOVEMBER 28: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge smile and wave to the crowds from the balcony of Cambridge Guildhall as they pay an official visit to Cambridge on November 28, 2012 in Cambridge, England. (Photo by Chris Jackson/Getty Images)

The Duke And Duchess Of Cambridge Make An Official Visit To Cambridge

CAMBRIDGE, UNITED KINGDOM - NOVEMBER 28: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge smile and wave to the crowds from the balcony of Cambridge Guildhall as they pay an official visit to Cambridge on November 28, 2012 in Cambridge, England. (Photo by Chris Jackson/Getty Images)

The Duke And Duchess Of Cambridge Tour Southeast Asia - Day 3

SINGAPORE - SEPTEMBER 13: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit the British High Commisioner to Singapore's residence, Eden Hall on Day 3 of Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge's Diamond Jubilee Tour of South East Asia on September 13, 2012 in Singapore. Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are on a Diamond Jubilee Tour of South East Asia and the South Pacific taking in Singapore, Malaysia, Solomon Islands and Tuvalu. (Photo by Ian Vogler-Pool/Getty Images)