Reese Witherspoon: 'Wild' Star & Producer!

Reese Witherspoon carries a bag of groceries while exiting Whole Foods supermarket on Saturday (July 20) in Brentwood, Calif.

The day before, the 37-year-old actress donned a Nike cap after breaking a sweat at a local gym.

PHOTOS: Check out the latest pics of Reese Witherspoon

It was recently announced that Reese will star and produce the upcoming adaptation of Cheryl Strayed‘s bestselling book “Wild“.

Wild centers on a “26-year-old woman, dismayed by the dissolution of her marriage and the death of her mother, who decides to hike the 1,000-mile Pacific Crest Trail alone.”

15+ pictures inside of Reese Witherspoon heading out for a workout…