The Duke and Duchess of Cambridge are in the university city that is the home of their dukedom. William and Kate will tour Cambridge for the first time since they adopted their titles on their wedding day in April last year.
One of the highlights of the visit will see the royal couple officially open a new 24-hour support centre for rough sleepers run by the charity Jimmy's.
William has been a patron of the homeless organisation Centrepoint since 2005 and Jane Heeney, one of the new centre's managers, said the Duke and his wife would get a real insight into the work they do.
Speaking about the royal visit she told the Cambridge News: "It is an incredible honour - in fact it's more than that. But we want them to see Jimmy's as it really is.
"The guests will be making biscuits for the royal couple and we will show them around and introduce them to staff and guests. Everyone is incredibly excited."
The couple will also visit the Guildhall to chat to local dignitaries, officials, community groups and volunteers associated with the city, then meet crowds as they walk through Cambridge's Market Square to the University of Cambridge's Senate House where William will make a speech at a reception attended by around 400 people.
Later the Duke and Duchess will watch a drama, music and dance presentation at Manor School which for the past three years has been involved with a Prince of Wales charity - the Prince's Teaching Institute, which offers teachers opportunities to develop their skills.
William and Kate will end their day in Cambridgeshire by opening Peterborough City Hospital and greet patients and staff at the multi-million pound institution.
The royal couple will also be given a tour of some of the facilities and equipment at the 612-bed hospital, which opened in November 2010.