He grins because that's fucking awesome. That's some true Disney princess shit. If only he knew.

"Good! Pretty sure that means you made the right choice. I've been to some weddings where shit went real sideways. Like I was at this one and the bridesmaid was telling me all about how the bride cheated on the groom with the best man and the groom had been sleeping with the bride's sister and they were only getting married cuz she was knocked up and didn't want anyone to know. Which.. kinda standard in Montana I guess." Which Pratt only found out this juicy gossip because he was boning the bridesmaid in a closet somewhere.