‘9-1-1: Lone Star’ Season 4 Finale Promo: Sneak Peek at Vows at Tarlos Wedding (VIDEO)

The happy day is almost here — and it looks like everything should go well. 9-1-1: Lone Star is ending its fourth season with T.K. (Ronen Rubinstein) and Carlos’ (Rafael Silva) wedding, and the promo is all about the event.

“You’re the best man I know, and that’s’ why I would like you to be my best man,” Carlos tells his dad. T.K.’s father, Owen (Rob Lowe), then toasts the couple during the rehearsal dinner with, “it was meant to be.”

The video, which you can watch above, also offers a taste of Carlos’ wedding vows: “You are the dream I would not allow myself to have. You are the key that unlocked me.” Oh, it’s going to be an emotional two hours.

But we can’t help but be a bit nervous after Owen’s “it’s like a perfect moment,” especially after reading the logline for the two episodes, “Best of Men” and “In Sickness and In Health,” making up the finale: “Owen is conflicted when his brother Robert (guest star Chad Lowe) asks him for help, Judd [Jim Parrack] and Grace [Sierra McClain] face a family crisis, [and] as T.K. and Carlos prepare for their wedding day, tragedy strikes.”

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Parrack told TV Insider, “The wedding was beautiful, and it was a lot of fun to shoot. I remember our last night of shooting the very last moments of the season; it was really emotional. Everybody was just moved by how much we’ve come to love each other, and how nice this season is wrapping up, and how beautifully they crafted the ending few scenes. It was really emotional for everybody and very touching and stirring.”

However, he also teased, “There are enormous curveballs or enormous surprises that are kind of jaw-dropping, and really, really beloved characters have to use some incredibly difficult things that almost stretch the limits of what they’re able to do, and it happens very quickly.” At least we know 9-1-1: Lone Star will be back for Season 5.

Scroll down to check out the photos from the finale.

9-1-1: Lone Star, Two-Part Season 4 Finale, Tuesday, May 16, 8/7c, Fox