Garrett Hedlund: Kristen Stewart is excellent in On The Road
Hedlund and Stewart star alongside Sam Riley, Kirsten Dunst, Tom Sturridge and Amy Adams in the film, which is a portrait of the Beat Generation during the 50s.
Directed by Walter Salles, the film is based on Jack Kerouac's book of the same name.
Speaking to Access Hollywood, Hedlund praised Stewart's ability to focus on the role at hand.
"Kristen's phenomenal," he said. "She's so focused, especially on this role... she's so amazing and the world is going to get to really see that in this one."
The actor went on to say that filming the movie was "wonderful", admitting he is "very proud" of it.
On The Road is set for release in the US later this year, while Stewart will next appear in the UK in The Twilight Saga: Breaking Dawn – Part 1, which will hit cinemas on November 18th.