Jenna Fischer (left) as Darlene Madison and John C. Reilly as Dewey Cox in Walk Hard: The Dewey Cox Story.

Fischer plays a backing singer who tames John C. Reilly's wild rocker Dewey Cox in the mock rockumentary, a parody of the Johnny Cash biopic for which Witherspoon won a Best Actress Academy Award.

And Fischer admits she didn't have to look far for her inspiration.

She says, "It's a complete rip-off of Reese Witherspoon. I watched Walk The Line and just stole all her dance moves and her accent, but I don't sing. I took some voice lessons, but I couldn't pull it off."

Source: WENN