"You don't see my Jon Stewart," he quipped on Monday's Late Late Show, leading host James Corden to joke that you do see Pratt's "John Oliver."
Clarifying how naked he is in the space film, the 37-year-old actor added frankly, "You see my butt."
Office Christmas Party star Olivia Munn was also a guest on the late-night program and asked Pratt about how specific he got when drawing up his nudity clause. "You really stipulate what they are and are not allowed to show," he explained.
"Your contract is butt cheek and one ball," Corden quipped. "Well, I only have the one," Pratt joked back. "But I don't let them see the upper part."
Pratt also shared a story about the time he got "starstruck" when hanging out with Munn and her boyfriend, Green Bay Packers quarterback Aaron Rodgers, and attempted to grill for his guests. "When Aaron Rodgers comes to your house, you think, 'I better man up here, you know?' So I planned some manly things because I desperately, of course, want him to be my friend," he admitted. "At first, it took me, like, 20 minutes to figure out how to turn the [grill] on, and then I grilled. I’d heard the best way to do it, is to just crank it up as hot as possible and then just sear it. Well, I seared it for, like, 20 minutes too long."
"What happened is, it was a rental house and the guy who had it before must grill, like, 50 times a day because it was caked with all this grease," he continued. "That [grease] caught on fire, so [the steak] was sitting essentially in the center of a fire. It wasn't just getting grilled from a foot away."
Pratt exclaimed, "I got nervous! I wanted [Rodgers] to be my friend."
Attempting to comfort the actor, Munn responded, "He really likes you and he'd like to hang out again!"