The couple spent a quiet weekend together following the massive publicity surrounding their wedding announcement on Thursday.
In the coming weeks, they are expected to complete preparations for their April 8 civil wedding ceremony at Windsor Castle (search). It will not be a Church of England service, since both are divorcees.
The prince was spending Monday on official engagements in Staffordshire and Cheshire counties in central England, meeting with cheese makers and farmers.
On his rural tour, the prince went to the Peak District National Park to meet with organic farmers. At Beechenhill Farm, owners Terry and Sue Prince explained their operation to the prince and offered congratulations on his engagement.
In the evening, he was to return to Highgrove, his country estate in Gloucestershire, western England, to spend the rest of Valentine's Day with Parker Bowles.
Over the weekend, Charles and his future wife only emerged from Highgrove on Sunday to attend a service at a nearby church. The couple joined a congregation of 34 people in tiny, picturesque St. Leonard's Church in the leafy village of Didmarton.
The Rev. Christopher Mulholland said the two were welcome guests, taking their normal seats in the front pew.
"People are very glad when two of the congregation have decided to get married. There was a great sense of good will," Mulholland said.
After the wedding, Parker Bowles will be called HRH (Her Royal Highness) Duchess of Cornwall, rather than the Princess of Wales, the title Diana used. Princess Diana blamed the on-again, off-again romance between Charles and Parker Bowles for the breakdown of their marriage in 1992.
The newly engaged couple agreed that when Charles becomes king, she will not be known as Queen Camilla, but as the royal family's first Princess Consort.