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Sophia Bush rocks a bright yellow jacket while attending the One Chicago Day event held at Lagunitas Brewing Company on Monday (October 24) in Chicago, Ill.

The 34-year-old actress was joined by her Chicago P.D. co-stars Jon Seda and Jesse Lee Soffer.

The event was held to celebrate NBC’s four Chicago-based TV shows – Chicago P.D., Chicago Fire, Chicago Med, and the upcoming series Chicago Justice. It included pumpkins carved with the series’ names and a real Chicago firefighting demonstration!

Other cast members from the shows who were in attendance included Marina Squerciati, LaRoyce Hawkins, Kara Killmer, Carl Weathers, Torrey Devitto, Christian Stolte, Taylor Kinney, Joelle Carter, Yaya DaCosta, Colin Donnell, Eamonn Walker, Oliver Platt, Rachel DiPillo, Philip Winchester, Monica Barbaro, and Nick Gehlfuss.

“Sister smooches, from our family to yours! #OneChicagoDay #SisterSister #Monphia #Mona #MonicaRaymund,” Sophia captioned an Instagram selfie she took on the red carpet with Chicago Fire star Monica Raymund (below).

55+ pictures inside of Sophia Bush and other celebs at the One Chicago Day event… More Here! »

Sophia Bush walks the red carpet while attending the NBC Universal Press Day at the 2015 Summer TCA Tour on Thursday (August 13) in Beverly Hills, Calif.

The 33-year-old actress stars on the series Chicago P.D. and she was joined by the cast of the franchise’s latest show, Chicago Med. Colin Donnell, Oliver Platt, Yaya Dacosta, Brian Tee, S. Epatha Merkerson, and Nick Gehlfuss all were in attendance.

Chicago Med is going to premiere on November 17 and there’s going to be a four-way crossover event with all three Chicago shows and Law & Order: SVU in February.

“The crossovers are incredible ratings engines for us,” executive producer Dick Wolf said. “What we can’t do is have them become commonplace. [There are] three this season, but they won’t include all the shows.”

FYI: Sophia is wearing a Self Portrait dress, Stuart Weitzman shoes, an Edie Parker clutch, and Neil Lane jewelry.