The Duchess of Cornwall was presented with armfuls of gifts from traders, as she toured Borough Market.
Florist Sharon Crane, 45, whose business opened today, gave her first bunch of flowers to the Duchess for free.
Afterwards she said: "I told her 'I'm giving you a bouquet of flowers in case your husband forgets' and she said she was hoping to get some."
She was also presented with a massive chocolate heart, decorated with the words "with love from Borough Market".
But it seems Charles is having a rather less romantic Valentine's day. When asked by David Ruane, a worker from a nearby pub, if he'd received a card, he rolled his eyes and said: "No, I don't think so."
They're not exactly regular tube users, so commuters were rather surprised to see Prince Charles and The Duchess of Cornwall underground this morning. The Royal couple swiped in using their own oyster cards, like the rest of us, but their journey was anything but average, as Rags Martel reports.
Today's journey was the first ever joint tube trip for Prince Charles and the Duchess of Cornwall.
Although both of them now qualify for an over-60s Freedom Pass, they were presented with commemorative Oyster cards topped up with £10 credit for the one stop journey from Farringdon to King's Cross.
A brand new train was used, which arrived at the platform empty. But members of the public boarded along with the royal couple - separated only by a group of policemen standing further down the carriage.
When the royal couple arrived at King's Cross they were taken to "Platform nine and three quarters", a Harry-Potter themed attraction in the station.
In the books by JK Rowling, the "Hogwarts Express" steam train leaves from a secret platform, which witches and wizards reach by pushing a trolley through a wall.
But Charles and Camilla remained firmly in the land of the "muggles" or non-wizards.