The Oscar winning actress was in Santa Monica, near Los Angeles, when the vehicle struck her while travelling at around 20 miles per hour, and she was taken to a nearby hospital for treatment.
Police Sergeant Richard Lewis said: "The initial investigation revealed that the driver of the vehicle, an 84-year-old female resident of Santa Monica, was travelling southbound and struck a female pedestrian jogging westbound within an unmarked crosswalk."
The driver of the car was given a citation for failing to yield to a pedestrian in a crosswalk.
The `Walk the Line` star`s spokesperson, Nanci Ryder, told E! News she was not seriously hurt in the accident and is now "resting comfortably at home".
Earlier this year, Reese - who has two children, Ava, 12, and Deacon, 8, with her ex-husband Ryan Phillippe - had to wear a soft cast on her left foot after badly twisting her ankle.
Thankfully that injury happened after her March wedding to Hollywood agent Jim Toth, during which she wore a pair of skyscraper heels, although she was quick to swap them for cowboy boots at her reception as they were more comfortable for her to dance in.