Duchess Kate on Valentine's Day visit to Liverpool

Kate, Duchess of Cambridge, speaks with a boy while visiting Alder Hey Children's Hospital in Liverpool, England, on Feb. 14, 2012. The Duchess has been taking the opportunity to expand her royal role during husband Prince William's six-week deployment to the Falkland Islands as a search-and-rescue helicopter pilot with the Royal Air Force (RAF).

Kate, Duchess of Cambridge, hugs a young girl as she visits Alder Hey Children's NHS Foundation Trust on Feb. 14, 2012, in Liverpool, England. The Duchess has spent the day in Liverpool and arrived at Alder Hey Hospital after a visit to The Brink, an alcohol-free bar linked to an addiction charity she supports.

Kate, Duchess of Cambridge, smiles as she visits Alder Hey Children's NHS Foundation Trust on Feb. 14, 2012, in Liverpool, England.

Jaqson Johnston-Lynch, 8, presents Kate, Duchess of Cambridge, a bouquet of red roses and a Valentine's Day present after her visit to The Brink, an alcohol-free bar linked to an addiction charity she supports, on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, meets a young girl as she visits Alder Hey Children's NHS Foundation Trust on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, visits Alder Hey Children's Hospital in Liverpool, north-west England, on Feb. 14, 2012.

Kate, Duchess of Cambridge, meets young girls as she visits Alder Hey Children's NHS Foundation Trust on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, hugs 3-year-old Nancy Williams as she visits Alder Hey Children's NHS Foundation Trust on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, meets the crowd as she visits Alder Hey Children's Hospital in Liverpool, England, on Feb. 14, 2012.

Kate, Duchess of Cambridge, is given a toy rose as she visits Alder Hey Children's Hospital on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, receives a valentine's card from Ethan Harris as she visits Alder Hey Children's Hospital on Feb. 14, 2012, in Liverpool, England. The duchess is in Liverpool visiting charities in the city without husband Prince William, who is serving in the Falklands.

Kate, Duchess of Cambridge, unveils a plaque with Ethan Harris as she visits Alder Hey Children's Hospital on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge talks to patient Carson Hartley as she visits Alder Hey Children's Hospital on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, visits Alder Hey Children's Hospital on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, visits Alder Hey Children's Hospital in Liverpool, England, on Feb. 14, 2012.

Kate, Duchess of Cambridge, arrives for a visit at The Brink, an alcohol-free bar in Liverpool, England, on Feb. 14, 2012. The bar, run by the charity Action on Addiction, is a social enterprise run primarily to help people recovering from drink and drug addiction. She visited the Brink in her capacity as patron of Action on Addiction.

Kate, Duchess of Cambridge, arrives for a visit at The Brink, an alcohol-free bar in Liverpool, England, on Feb. 14, 2012. The bar, run by the charity Action on Addiction, is a social enterprise run primarily to help people recovering from drink and drug addiction. The duchess visited the Brink in her capacity as patron of Action on Addiction.

Kate, Duchess of Cambridge, stands behind the bar with Jacquie Johnston-Lynch, Merseyside head of service for Action on Addiction, and Paula Carey, making a smoothie called "The Duchess," at The Brink an alcohol-free bar which is a social enterprise run primarily to help people recovering from drink and drug addiction, on Feb. 14, 2012, in Liverpool, England.

Kate, Duchess of Cambridge, tries a smoothie called "The Duchess" at The Brink, an alcohol-free bar linked to the charity Action on Addiction, on Feb. 14, 2012 in Liverpool, England. The duchess is patron of the charity.