Pratt, who was named September's Man of Style by the magazine, shared a few shots from the Magnificent Seven-themed session, and explained some of the more unusual aspects from the day.
"Full disclosure I did not pick out any of the clothes which is kinda funny for a guy who is called the 'man of style,'" the 37-year-old heartthrob captioned a black-and-white pic from the shoot. "I mostly like T shirts with American flags on them. Usually I go for the one on the top of the 'shirt pile.'
"I want to promote this nice magazine called In Style Magazine because everyone who was there that hot day we were doing the photo shoot was really nice," he continued. “They had nice food spread out. And they played good country music. And there were horses all over the place."
Pratt said he remembered taking some photos with the horses, but those pictures didn't end up in the final spread. "Maybe I accidentally closed my eyes or maybe the horse's agent threw a Hollywood bitch fit for some reason," he theorized.
The actor also thanked the magazine for giving him a free shirt, marveling, "[It is] such a nice shirt. Like a flannel shirt but made out of pajamas and the thing cost like $500 or something ridiculous but they just gave it to me!!! So. Anyways. Hopefully this helps them at least sell $500 worth of magazines to make up for that sweet ass shirt."
Pratt then shared a photo of himself in another pose, looking causal as he leans against the wall with his hand in his pocket.
But what appears to be a moment of nonchalant sexiness was actually much less suave than it may seem.
"In this photo I try to casually put my left hand in my pocket but the pants are so tight I get the tip of three fingers in," Pratt wrote in the caption. "Also I was sweating so bad they give me that hat."
Next, he shared a shot of one of his denim ensembles in a photo where he seems to be causally adjusting his cool-guy popped collar.
"Here I'm pretending to itch my neck in a Canadian tuxedo," Pratt wrote. "Also, I am squinting. And thinking, 'Hmm, is it smokey in here? Am I allergic to smoke? Does it make my neck itchy?"
"I learned how to do that when I was making the #magnificent7 I basically learned a ton about dressing horses in funny clothes, hats, scarves, the like, you'll see a lot of that in the movie," Pratt continued. "Our horses are wearing funny little hats and boots and smoking pipes."
"Does anyone ever read this s**t? Haha! That's not true. None of it. Well the part about me putting the hat on the horses head is true," he added. "I'm like the horse whisperer. Right after this I got it to stand on one foot and break a board with a blind fold on. Then I jumped it. Over a mountain. Not to brag."