Sienna Miller & Pippa Middleton: All Saints Dinner Duo

Sienna Miller gets all dolled up for the All Saints dinner held at Petersham Nurseries on Thursday (October 13) in Richmond, England.

The 29-year-old actress, who wore a Matthew Williamson dress, was joined at the dinner by Pippa Middleton!

PHOTOS: Check out the latest pics of Sienna Miller

The All Saints party supported the Too Many Women organization, which fights against the devastation of breast cancer by raising money!

Also pictured inside: Pippa heading to work on Tuesday (October 11) and Wednesday (October 12) in London.

10+ pictures inside of Sienna Miller and Pippa Middleton at the All Saints party to support Too Many Women…