Justin Long: Drew Barrymore is passionate about acting
The actor stars alongside the Hollywood actress in Going the Distance, which focuses on a couple who are struggling to make their long-distance romance work.
Speaking to Reuters, Long said he was nervous about working with Barrymore because he didn't know how well they would work together.
"When you're working with somebody and when you know them [personally], you never know how it's going to be in a professional light," he said.
"But I saw first-hand day after day how much joy she took in what she did. I saw the way she treated people she worked with."
The film, which also stars Charlie Day and Christina Applegate, was released in the UK on August 27th.
Long will next star in The Conspirator, where he takes on the role of Nicolas Baker. He is also voicing the character of Humphrey in Alpha and Omega.