Reese Witherspoon gets down and dirty in the official trailer for Wild, which was released on Thursday. In the clip, Reese — who portrays author Cheryl Strayed in the big-screen adaptation — hikes the Pacific Crest Trail on an epic journey of self-discovery after losing her mother to cancer (Cheryl's mom, Bobbi, is played by Laura Dern). While in the grieving process, Strayed is also going through a divorce and turns to drinking, drugs, and promiscuity to cope. Even if you haven't read the book — which you definitely should — it's still pretty emotional watching Witherspoon as a woman crumbling under the weight of her own struggles. Watch the trailer below now, and let us know: are you excited to see Wild?