The Sex and the City star is a global ambassador for the charity and she headed to the U.K. city for the Eight Stories High gala to mark the 70th anniversary of the organisation.
Davis and Harry Potter star Bonnie Wright were among the famous faces who addressed the audience, while Colin Firth and Annie Lennox recorded special video messages for the event.
The 47-year-old actress donated a pair of black peep-toe Christian Louboutin stilettos to generate more cash for the charity.
An audience member named Bex posted on her blog, "Just spent the evening at Eight Stories High, an amazing Oxfam 70th birthday event.
"Kristin Davis (that's Charlotte from Sex and the City) gave a talk and was caught completely off guard when it was suggested that she donate her shoes to the cause. Of course, the beautiful lady said yes!"