An official portrait of the Duchess of Cornwall will be unveiled today as she visits a cruise liner during a tour of Hampshire.

Camilla is to attend the fifth birthday celebrations of the Queen Victoria liner at Southampton cruise terminal as part of a day of visits in Hampshire.

The portrait was commissioned by Cunard and created by Richard Stone, who has painted most members of the royal family during the past three decades.

The painting is a three-quarter length portrait showing Camilla seated and wearing a cream suit. It will be displayed in the grand lobby of the Queen Victoria, which the royal named in December 2007.

The portrait will be unveiled by Queen Victoria's madrina - shipyard sponsor - Maureen Ryan, who officiated at the float-out of the ship near Venice in January 2007.

During the visit, which is Camilla's third to the ship, she will meet 12 young adults who are taking part in Cunard's joint programme with the Prince's Trust to gain experience in the customer service industry.

She will also visit the ship's gingerbread display and cut a cake to mark the liner's anniversary.

Camilla, acting in her role as president of the National Osteoporosis Society (NOS) will also visit doctors, nurses and patients in a dedicated centre at the Medical Research Council Lifecourse Epidemiology Unit at Southampton General Hospital.

Her mother, Rosalind Shand died in 1994 at the age of 72 as a result of osteoporosis and her grandmother died from the same condition eight years earlier.

Camilla has been president of the NOS since 2001 having previously been its patron since 1997.

The Medical Research Council Lifecourse Epidemiology Unit is part of the University of Southampton and conducts research into preventable causes of common chronic disorders such as osteoporosis which leads to debilitating broken bones and affects one in two women and one in five men aged over 50 in the UK.

And also acting in her role as patron of the Emmaus homelessness charity, Camilla will tour its centre in Winchester which provides living accommodation, a shop and furniture restoration area.

Emmaus Communities enable people to move on from homelessness, providing work and a home in a supportive, family environment.