How Reese Witherspoon Transformed Her Perky Persona to Play a Girl Gone 'Wild'

The actress has two movies with Oscar buzz this season -- she also produced 'Gone Girl,' but David Fincher wouldn't cast her in it -- as she ditches her perky persona for darker roles, like the adaptation of Cheryl Strayed's memoir with depictions of her­oin use and drug-fueled sex: "This is one of the most important books I've ever read in my life"