EXCLUSIVE: 'Magnificent Seven' Star Chris Pratt on How He's Put His Cowboy Wardrobe to Good Use at Home

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Chris Pratt seems to have won over the hearts of fans and co-stars alike, but there's one person who's not impressed -- his 4-year-old son, Jack.

The newly minted action star told ET that when he showed his son a billboard for his new film, The Magnificent Seven, the young fella played it cool.

WATCH: 'Magnificent Seven' Director Says Stunt Professionals 'Were in Heaven' Making the Movie

"He looked and he goes, 'Huh,'" Pratt said.

Someone who does appreciate his cowboy getup is wife Anna Faris. Pratt said the couple has been having fun with the wardrobe at home.

"I dress up like a little cowboy for the old lady," Pratt shared. "She likes it."

The 37-year-old actor's family might be the reason he's remained so down-to-earth. Despite his status as a bankable box office star, he literally sang to get the part of Josh Faraday in the upcoming remake of The Magnificent Seven.

"Oh Shenandoah, I love your daughter," Pratt sang, giving us a preview of his audition.

WATCH: Chris Pratt Is the Most Badass Cowboy Ever in Action-Packed 'The Magnificent Seven' Trailer

In the Western, Sam Chisolm (Denzel Washington), Josh Faraday (Pratt), Goodnight Robicheaux (Ethan Hawke), Jack Horne (Vincent D'Onofrio), Billy Rocks (Byung-Hun Lee), Vasquez (Manuel Garcia-Rulfo) and Red Harvest (Martin Sensmeier) comprise the group of seven gunmen on a mission to free the town of Rose Creek from the control of industrialist Bartholomew Bogue (Peter Sarsgaard).

"[Pratt] just has that thing, you know?" Washington told ET. "Chicks love him and he's alright with the guys. It's a rare balance. I don't think he realizes what's going on yet, and that's great. I think that's beautiful."

The Magnificent Seven hits theaters Sept. 23.