The pop star-turned-actor was thrilled when he realised he would be working with one of his heroes and was very excited when the movie veteran suggested they hit one of America's most famous golf courses together for a round.
Timberlake tells WENN, "If you roll with Clint you can get on at Augusta (Golf Club) - no problem! That was amazing."
Eastwood also enjoyed playing with the young star: "That's what we did in our spare time in Georgia making this movie - played golf. I'm about a 16 handicap and he's a six. He's very good."