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Britain's Prince William, Duke of Cambridge and his wife Kate, Duchess of Cambridge, attend a reception during a visit to Centrepoint's Camberwell Foyer in London on Wednesday, Dec. 21, 2011. The national charity, Centrepoint, provides housing and support to improve the lives of homeless young people aged 16-25. (AP Photo / Ben Stansall, Pool)

Britain's Prince William, Duke of Cambridge and his wife Kate, Duchess of Cambridge, attend a 'healthy living cookery session' during a visit to Centrepoint's Camberwell Foyer in London on Wednesday, Dec. 21, 2011. The national charity, Centrepoint, provides housing and support to improve the lives of homeless young people aged 16-25. (AP Photo / Ben Stansall, Pool)

Britain's Prince William, Duke of Cambridge and his wife Kate, Duchess of Cambridge arrive for a visit at Centrepoint's Camberwell Foyer in London, Wednesday, Dec. 21, 2011. Centrepoint is a national charity providing housing and support to improve the lives of homeless young people aged 16-25 and Prince William is a patron of the charity. (AP Photo/Sang Tan)

Britain's Prince William, Duke of Cambridge and his wife Kate, Duchess of Cambridge arrive for a visit at Centrepoint's Camberwell Foyer in London, Wednesday, Dec. 21, 2011. Centrepoint is a national charity providing housing and support to improve the lives of homeless young people aged 16-25 and Prince William is a patron of the charity. (AP Photo/Sang Tan)

Kate, Duchess of Cambridge, attends a 'healthy living cookery session' with her husband Britain's Prince William, Duke of Cambridge, during a visit to Centrepoint's Camberwell Foyer in London on Wednesday, Dec. 21, 2011. The national charity, Centrepoint, provides housing and support to improve the lives of homeless young people aged 16-25. (AP Photo / Ben Stansall, Pool)

Britain's Kate, Duchess of Cambridge leaves Centrepoint's Camberwell Foyer in London after a visit, Wednesday, Dec. 21, 2011. Centrepoint is a national charity providing housing and support to improve the lives of homeless young people aged 16-25 and Prince William is a patron of the charity. (AP Photo/Sang Tan)

Kate, Duchess of Cambridge, applauds following a performance, during a visit to Centrepoint's Camberwell Foyer in London on Wednesday, Dec. 21, 2011. The national charity, Centrepoint, provides housing and support to improve the lives of homeless young people aged 16-25. (AP Photo / Ben Stansall, Pool)

Britain's Prince William, Duke of Cambridge and his wife Kate, Duchess of Cambridge, center, leave Centrepoint's Camberwell Foyer in London after a visit, Wednesday, Dec. 21, 2011. Centrepoint is a national charity providing housing and support to improve the lives of homeless young people aged 16-25 and Prince William is a patron of the charity. (AP Photo/Sang Tan)

Kate, Duchess of Cambridge, attends a 'Work-wise' programme meeting, during a visit to Centrepoint's Camberwell Foyer in London on Wednesday, Dec. 21, 2011. The national charity, Centrepoint, provides housing and support to improve the lives of homeless young people aged 16-25. (AP Photo / Ben Stansall, Pool)

Britain's Prince William, Duke of Cambridge dances with Vanessa Boateng, as his wife Kate, Duchess of Cambridge, looks on during a visit to Centrepoint's Camberwell Foyer in London on Wednesday, Dec. 21, 2011. The national charity, Centrepoint, provides housing and support to improve the lives of homeless young people aged 16-25. (AP Photo / Ben Stansall, Pool)

The Duke and Duchess of Cambridge arrive along with Prince Harry, right, at the Imperial War Museum for 'A Night of Heroes: The Sun Military Awards', in London, Monday Dec. 19, 2011. (AP Photo / Arthur Edwards, Pool)

The Duchess of Cambridge arrives at the Imperial War Museum for 'A Night of Heroes: The Sun Military Awards', in London, Monday, Dec. 19, 2011. The awards, run by The Sun newspaper, celebrate the bravery of members of the British armed forces and award individuals deemed to have served their country with the highest distinction in the past year. (AP Photo / John Stillwell, Pool)

The Duke and Duchess of Cambridge arrive along with Prince Harry, right, at the Imperial War Museum for 'A Night of Heroes: The Sun Military Awards', in London, Monday Dec. 19, 2011. (AP Photo / Arthur Edwards, Pool)

The Duke and Duchess of Cambridge arrive at the Imperial War Museum for 'A Night of Heroes: The Sun Military Awards', in London, Monday Dec. 19, 2011. (AP Photo / Arthur Edwards, Pool)

Britain's Prince Harry, left, and his sister-in-law Kate, Duchess of Cambridge attend "A Night of Heroes: The Sun Military Awards" at the Imperial War Museum in London, Monday, Dec. 19, 2011. The awards, run by The Sun newspaper, celebrate the bravery of members of the British armed forces and award individuals deemed to have served their country with the highest distinction in the past year. (AP Photo/Matt Dunham)