Actresses Sienna Miller and Sarah Jessica Parker have donated shoes to a charity called the Small Steps Project, run by former celebrity journalist Amy Hanson. The actresses have joined a host of stars, including Eva Green and Colin Firth, by giving away their most treasured footwear as part of the project. The charity, which came into being after Hanson spent time in Combodia in 2008, aims to raise awareness about children working on landfill sites.