Here's every Chicago Fire character who will be in the Brettsey wedding

Unsurprisingly, there's going to be lots of 51 representation.

CHICAGO FIRE -- "Port in the Storm" Episode 12006 -- Pictured: (l-r) Hanako Greensmith as Violet Mikami, Kara Killmer as Sylvie Brett, Eamonn Walker as Chief Wallace Boden, Jesse Spencer as Matt Casey, Taylor Kinney as Kelly Severide -- (Photo by: Adrian S Burrows Sr/NBC)

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Best Man: Kelly Severide

Chicago Fire - Season 8 — CHICAGO FIRE -- "Light Things Up" Episode 819 -- Pictured: (l-r) Randy Flagler as Harold Capp, Anthony Ferraris as himself, Jeff Lima as Leon Cruz, Jesse Spencer as Matthew Casey, Taylor Kinney as Kelly Severide -- (Photo by: Adrian Burrows/NBC)

That's right, he's coming back! Kelly Severide (Taylor Kinney) has been a tough man to get ahold of in season 12, but the promo for "Port in the Storm" confirms that he will be back to support his best pal Casey on the most important day of his life.

Casey returned to Chicago to serve as Severide's best man, so it's only fitting that the favor be returned. Plus, this may be the last time we get to see these two hang out and reflect on the lives that they've built for each other. We're looking forward to it.

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