Clint Eastwood can send a shiver down the spine of audiences with just one squint of his 82-year-old eyes, but his "Trouble with the Curve" co-star Justin Timberlake says Clint's oft-intimidating persona is all an act.
"What's funny is Clint is so good at that character [that] everyone sort of thinks that he's really like that -- but he's really not," Justin told Access Hollywood at the "Trouble with the Curve" premiere in Los Angeles on Wednesday. "He's actually really charming and he's a really funny guy."
PLAY IT NOW: Justin Timberlake Hits A Home Run In Trouble With The Curve
Justin said hinted that Clint even joined in a few bars of JT's famed Emmy-winning "Saturday Night Live" song, "D*** in a Box" during their downtime while filming.
"Yeah, we may or may not have sung 'D in a B' together on set -- I'm just saying," he told Access with a sly smile, jokingly adding that he couldn't divulge the contents of his and Clint's jam sessions due to a "legal obligation."
VIEW THE PHOTOS: Boy Bands: Then & Now
"What's part of the process is part of the process [is confidential]," he added, with a laugh.
Clint and Justin were already acquainted prior to their collaboration on the upcoming baseball-themed movie, and JT said he was honored to get the opportunity to work with the award-winning star.
"I had met Clint prior due to our [shared] obsession with golf, so I had played in the Pebble Beach Pro-Am and you know, Clint used to be the mayor up there ," he explained, referencing the iconic actor/director's run as mayor of Carmel, Calif. "He still is the mayor. He's like the mayor of the world!
VIEW THE PHOTOS: ‘Saturday Night Live’
Adding, "So yeah, we had met prior to [the film] so this was a lot of fun. It was a lot of fun to really get a chance to work with such a legend."
As for Clint, he too enjoyed working with Justin, who he said he's known since JT's *NSYNC days.
VIEW THE PHOTOS: Justin Timberlake: From The Stage To The Red Carpet!
"[Justin] is a good kid, he's a good guy," Clint said.
"Trouble with the Curve," which also stars John Goodman and Amy Adams, hits theaters on Friday.
Copyright 2012 by NBC Universal, Inc. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.