Davis, who played receptionist Dawn, married Troy actor Owain Yeoman at St Paul's Cathedral in front of around 300 guests.
They included Martin Freeman, who played Tim - who fell in love with Dawn, Mackenzie Crook, who played co-worker Gareth and Joel Beckett - Dawn's no-good boyfriend Lee. Also present was Davis's proud father, comedian Jasper Carrott.
One of the guests, who were transported to the ceremony in double-decker buses, commented: "As Dawn she was a tad podgy, very much the girl-next-door. But today she looked like a Hollywood star - toned, thin and radiant."
Lucy said she felt "good" after the big day, while Carrott added: "I'm very proud. It was amazing, very emotional. Lucy looked really stunning."