Behind the Scenes with Chris Pratt at 'Saturday Night Live'

It's no wonder Chris Pratt was tapped to host Saturday Night Live's season 40 opener. The beloved Parks and Recreation actor became a bona fide movie star when he ruled the box office this summer with the No. 1 movie of the year, Guardians of the Galaxy. The Marvel film raked in more than $300 million stateside, plus $600 million worldwide! ET was eager to go behind the scenes of Pratt's SNL promo shoot and learn a few things about our favorite funnyman.

Pratt, 35, has always been a heartthrob, but this was further confirmed when he posted a throwback headshot, referring to himself as "D**chemaster McChest." Of the dreamy photo, he told ET, "Oh, look at that. Look at this young boy full of ambition. You know what this kid's dream was right here? It was to host SNL." Destiny fullfilled!

Before he found fame, Pratt was living in what he calls a Scooby Doo van! Sharing another flashback photo on his Facebook on August 15, Pratt wrote: "Can't believe I found this picture!! That is the van I lived in!! In my hand is the script for the movie that got me out of Maui. Crazy."

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The actor assured ET it wasn't as bad as it seems because he had roommates. "Honestly I don't think," the highly quotable Pratt admits. "I just don't, no thinking. That's my key and so far it's worked out because I was in a van and now I'm here at SNL, so yeah." You do you, Chris Pratt!

The breakout star is hosting SNL with musical guest Ariana Grande, but don't ask him if he knows of the pop singer.

"I didn't know Ariana Grande until I saw her sing at the Seahawks game," he confesses. "I'm a country music fan. That's probably not the best thing to say."

This will be Pratt's first time hosting the late-night sketch comedy show, but thankfully he has the guidance of his Parks & Rec co-star and SNL alum, Amy Poehler, as well as his wife Anna Faris, who's hosted twice.

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"I have been hitting up Amy all week for advice," he says. "How lucky am I to have access to a pro like her, she's a legend."

He adds, "Also my wife Anna Faris has hosted the show twice so I've been able to get perspective of both a seasoned veteran in the cast and somebody who's hosted a couple of times so I'm going to knock this out of the park."

We'll find out when season 40 of SNL premieres this Saturday on NBC. Hey, if all else fails, at least we know he's good at French braiding hair.

Follow Denny on Twitter @DDirecto.