Justin Timberlake has been described as a 'perfectionist' by co-star Johnny Galecki.
The pair star together in Andrew Niccol's new sci-fi movie In Time and Galecki was impressed with Timberlake and his work ethic on set.
Speaking to Parade the actor said: "He's a perfectionist. I was really impressed. He has a great instinct, whether he's on or off camera.
"I've never seen someone who had such success in another area of entertainment be so willing to work as hard as he does. He doesn't rest on any of those laurels.
"He knows that performing at Madison Square Garden doesn't necessarily mean you're going to be a great actor in an action film."
In Time is the third film of the year with Friends With Benefits and Bad Teacher under his belt.
He has also been linked with Inside Llewyn Davis - the new movie from the Coen Brothers.
In Time is out now