Photos by Lucas Orme Fancy walking a mile in Sarah Jessica Parker's shoes? What about Colin Firth's, Helen Mirren's, or Ralph Fiennes's? The A-list celebrities are just some of the bold-faced names lending a hand—or rather, shoe—to an organization that aids children living in landfills and garbage slums worldwide. The donated footwear, which includes high-end labels such as Christian Louboutin, Manolo Blahnik, and Hugo Boss, will be auctioned off on October 15 at the Royal Society of Medicine in London. Click through our slideshow for a preview of the event's start-studded roster.