Edward Norton Shares Charming Will Smith Stories From 'Collateral Beauty'

— -- Edward Norton is starring as Will Smith's best friend and partner in the new movie, "Collateral Beauty."

The two actors not only had an "easy rhythm" during filming but also shared a lot of laughs, Norton said on "Good Morning Amerca."

"Will has the incredible ability to flip the switch from doing his magic [on screen] ... then being a completely jocular and funny guy," he said of his co-star. "[W]e were both quite obsessed with 'Hamilton' like everybody else in the world and Will ... suddenly you would hear a piece of the soundtrack just start from the corner of the sound stage. Will lives up to his reputation for being a sweet and grounded and very talented guy."

Norton joins an all-star cast in the movie including Helen Mirren, Kate Winslet, Keira Knightley and Smith.

The drama follows a New York advertising executive (Smith) who after a tragedy, seeks answers from the universe by writing letters to Love, Time and Death.

"This is just a tremendous, tremendous group of actors," Norton said on "GMA." "Will's incredibly beautiful performance -- he plays a person who's grieving and the rest of us try to get him out of his paralysis and I think it ends up being one of those films that's in the vein of 'It's a Wonderful Life,' it touches on very serious subjects about what's most important in life, but with a lot of good humor and a little bit of fantasy. It's a really nice movie for the end of the year."

"Collateral Beauty" hits theaters Dec. 16.