Sienna Miller: 'Flare Path' Performer

Sienna Miller leaves the Theatre Royal Haymarket after performing in her play, Flare Path, on Tuesday (April 26) in London, England.

The 29-year-old British actress was one of a handful of celebs who joined Earth Day Network’s Billion Acts of Green Campaign, which encourages people to do their part in helping the environment.

Since her pledge last year, Sienna has visited India as an ambassador for Global Cool to help raise awareness about the damaging effects of global warming.

FYI: Sienna is wearing Twenty8Twelve jeans.

10+ pictures inside of Sienna Miller leaving her Flare Path performance…