Kate Middleton reacts to the crowd, during a visit to Witton County Park, Darwen, near Blackburn, England Monday, April, 11, 2011. Middleton is to wed Britain's Prince William at Westminster Abbey on April 29. (AP Photo/Alastair Grant, Pool)

Kate Middleton reacts to the crowd at Witton County Park, Darwen, England Monday, April, 11, 2011. Prince William and fiancee Kate Middleton visited northwest England on Monday to support local youth charities _ the last trip in their pre-wedding tour of England, Scotland, Wales and Northern Ireland. (AP Photo/Alastair Grant, Pool)

Kate Middleton, fiancee of Britain's Prince William watches a demonstration by students during a visit with William to Darwen Aldridge Community Academy in Darwen, England, Monday April 11, 2011. Prince William and fiancee Kate Middleton visited northwest England on Monday to support local youth charities _ the last trip in their pre-wedding tour of England, Scotland, Wales and Northern Ireland. (AP Photo/Adrian Dennis, Pool)

Kate Middleton, fiancee of Britain's Prince William, stands behind a dress mannequin in a textile class during a visit with William to Darwen Aldridge Community Academy in Darwen, north-west England, Monday April 11, 2011. The couple visited northwest England on Monday to support local youth charities _ the last trip in their pre-wedding tour of England, Scotland, Wales and Northern Ireland. The couple plan to marry April 29. (AP Photo/Adrian Dennis, pool)

Kate Middleton smiles as she visits Greenmount College in Co Antrim, during a visit to Northern Ireland with fiance Britain's Prince William, on March 8, 2011. Britain's Prince William and his bride-to-be Kate Middleton arrived in Belfast on Tuesday for a one-day visit, under the watchful eye of armed police on the surrounding rooftops. It is the couple's first official visit to Northern Ireland, and they were greeted enthusiastically by a small crowd who had gathered in the grounds of City Hall for a glimpse of the royal pair. AFP PHOTO/Paul Faith/POOL

An undated handout picture obtained in London, on March 7, 2011, from the Middleton family, shows Kate Middleton, (L) aged four, with her father and sister Pippa in Jerash, Jordan. Family photos of Kate Middleton were released Monday ahead of her wedding to Prince William next month, showing her progression from a smiling child to the girlfriend of a future king. AFP PHOTO/THE MIDDLETON FAMILY/HANDOUT/NO ARCHIVES

An undated handout picture obtained in London, on March 7, 2011, from the Middleton family, shows a picture of Kate Middleton, aged five, in the United Kingdom. Family photos of Kate Middleton were released Monday ahead of her wedding to Prince William next month, showing her progression from a smiling child to the girlfriend of a future king. AFP PHOTO/THE MIDDLETON FAMILY/HANDOUT/NO ARCHIVES

An undated handout picture obtained in London, on March 7, 2011, from the Middleton family, shows a picture of Kate Middleton, aged three, while on holiday in the Lake District, north-west England. Family photos of Kate Middleton were released Monday ahead of her wedding to Prince William next month, showing her progression from a smiling child to the girlfriend of a future king. AFP PHOTO/THE MIDDLETON FAMILY/HANDOUT/NO ARCHIVES

A handout picture obtained in London, on March 7, 2011, from the Middleton family, shows a picture of Kate Middleton (L) and her fiancee Prince William on their graduation day at St Andrews University in Scotland, in June 2005. Family photos of Kate Middleton were released Monday ahead of her wedding to Prince William next month, showing her progression from a smiling child to the girlfriend of a future king. AFP PHOTO/THE MIDDLETON FAMILY/HANDOUT/NO ARCHIVES

Prince William (L) and his fiancee Kate Middleton wave as they pass St Salvator's halls during a visit to the University of St Andrews in Scotland on February 25, 2011. During the visit they viewed the surviving Papal Bull (the university's founding document), unveiled a plaque, and met a selection of the University's current staff and students to mark the start of the Anniversary. Prince William and Kate Middleton attended the university as students from 2001 to 2005 and began their romance in St Andrews.2011. AFP PHOTO/WPA POOL/ANDREW MILLIGAN

Britain's Prince William and Kate Middleton speak to spectators, during a visit to the University of St. Andrews, in St. Andrews, Scotland, where they first met, Friday Feb. 25, 2011. The couple, who both graduated from the university, are scheduled to marry on April 29, at London's Westminster Abbey.(AP Photo/Danny Lawson, pool)

FILE -- June 23 2005 file photos of Kate Middleton, left, and Britain's Prince William after their graduation ceremony at St Andrews University, in Scotland. Thousands of well-wishers lined the streets of St Andrews to cheer Prince William and his fiancee Kate Middleton as they returned to the university where their romance began, Friday Feb. 25, 2011. The couple, who will marry on April 29, were given a warm welcome by the large crowd who turned out to see them on their first official engagement in Scotland.(AP Photo/Michael Dunlea, pool, file)

Prince William and Kate Middleton during a visit to the St Andrews Museum, where they viewed the Papal Bull in St Andrews Scotland Friday February 25, 2011. The Papal Bull is the charter issued by the Pope in 1411 that established the university. William and Kate who first met whilst studying at the University of St Andrews helped mark the start of the 600th anniversary of the university's foundation. The couple will be married at Westminster Abbey on April 29. (AP Photo/Andrew Milligan/Pool)

Kate Middleton, the fiancee to Britain's Prince William, smiles during a naming ceremony for the new Royal National Lifeboat Institution's (RNLI) Atlantic 85 lifeboat 'Hereford Endeavour' at the RNLI Lifeboat Station in Anglesey, near Bangor in Wales, on February 24, 2011. Kate Middleton got a taste of life as a working royal Thursday when she and Prince William dedicated a lifeboat in their first official appearance since their engagement. Hundreds of people cheered as the smiling 29-year-old princess-to-be poured a bottle of champagne over the vessel in a dedication service at the lifeboat station Trearddur Bay on Anglesey, northwest Wales. AFP PHOTO/PHIL NOBLE/POOL

Kate Middleton, the fiancee to Britain's Prince William, smiles during a naming ceremony for the new Royal National Lifeboat Institution's (RNLI) Atlantic 85 lifeboat 'Hereford Endeavour' at the RNLI Lifeboat Station in Anglesey, near Bangor in Wales, on February 24, 2011. Kate Middleton got a taste of life as a working royal Thursday when she and Prince William dedicated a lifeboat in their first official appearance since their engagement. Hundreds of people cheered as the smiling 29-year-old princess-to-be poured a bottle of champagne over the vessel in a dedication service at the lifeboat station Trearddur Bay on Anglesey, northwest Wales. AFP PHOTO/Phil Noble/POOL

Kate Middleton, the fiancee to Britain's Prince William, talks to a lifeboat crew during a Naming Ceremony and Service of Dedication for the Royal National Lifeboat Institution's (RLNI) new Atlantic 85 Lifeboat, the 'Hereford Endeavour', at the RNLI Lifeboat Station in Anglesey, near Bangor in Wales, on February 24, 2011. Kate Middleton got a taste of life as a working royal Thursday when she and Prince William dedicated a lifeboat in their first official appearance since their engagement. Hundreds of people cheered as the smiling 29-year-old princess-to-be poured a bottle of champagne over the vessel in a dedication service at the lifeboat station Trearddur Bay on Anglesey, northwest Wales. AFP PHOTO/Phil Noble/POOL

(FILES) A file photo taken December 15, 2006, shows Kate Middleton, girlfriend of Britain's Prince William, as she arrives at the Sovereign's Parade at The Royal Military Academy in Camberley, west of London. Britain's Prince William, the second in line to the throne, will marry his long-term girlfriend Kate Middleton next year, Clarence House said Tuesday, November 16, 2010. William, 28, the eldest son of heir to the throne Prince Charles and the late Princess Diana, and Middleton, also 28, became engaged in October while on holiday in Kenya, it said in a statement. AFP PHOTO/BEN GURR/POOL/FILES

Michael and Carole Middleton, the parents of Britain's Prince William's fiancee Kate, pose for a photograph at their home in Berkshire, southern England on November 16, 2010. Britain's Prince William will marry long-term girlfriend Kate Middleton next year, ending feverish speculation about when the second-in-line to the throne would wed, the royal family announced Tuesday. William, the eldest son of heir to the throne Prince Charles and the late Princess Diana, and Middleton, the daughter of a wealthy businessman, got engaged in October while on holiday in Kenya, said Clarence House, Charles' official residence. AFP PHOTO / STEFAN ROUSSEAU / POOL

HRH PRINCE WILLIAM TODAY ATTENDED THE WEDDING OF HIS FRIEND HUGH VAN CUTSEM AT ST JOHN THE BAPTIST CHURCH, BURFORD, OXFORDSHIRE, ENGLAND. ALSO ATTENDING WERE HIS FORMER NANNY TIGGY LEGGE-BOURKE HIS CURRENT 'GIRLFRIEND' KATE MIDDLETON AND JESSICA 'JECCA' CRAIG WHO HAS, FOR A LONG TIME HAD A SLOSE RELATIONSHIP WITH THE PRINCE. PICS: GEOFF SWAINE/LFI 4 JUNE 2005

KATE MIDDLETON, THE GIRLFRIEND OF PRINCE WILLIAM, ATTENDS THE SECOND DAY OF THE GATCOMBE PARK FESTIVAL OF BRITISH EVENTING, HELD AT GATCOMBE PARK NEAR TETBURY IN ENGLAND. 6 AUGUST 2005. PICTURES: ANWAR HUSSEIN/LFI