The 35-year-old actor has not been seen at a public event since May.
Taylor Kinney and Lady Gaga are both back to work.
While the 30-year-old singer is busy promoting her new album, Joanne, which was released last Friday, the 35-year-old actor hit the red carpet on Monday in Chicago, Illinois, to promote the upcoming season of his show, Chicago Fire.
Kinney joined his co-stars from Fire and the other Chicago series -- P.D., Justice and Med -- for NBC's press day, which was followed by a kick-off party for the casts. On the red carpet, Kinney dressed up as his character, firefighter Kelly Severide, but changed into gray blazer and black v-neck shirt for the party.
This marks the TV star's first official public appearance since his breakup from Gaga in July. While Kinney has yet to speak about their split, Gaga opened up to Howard Stern on his SiriusXM radio show on Monday about calling off their engagement. "We love each other, that’s it,” she explained. "It’s just about life changes, and we all go through different stages and we’re focused on different things."
WATCH: Lady Gaga Is 'Absolutely Not' Interested in Dating A Star Is Born Co-Star Bradley Cooper
Continuing to gush over her ex-fiance, Gaga added, "To be fair, I think that Taylor’s pretty f**king cool. ...Over the years, no matter what creative transformation that I’ve gone through, he’s always been very supportive of that and loving."
She also admitted that a good deal of Joanne is inspired by Kinney. "There’s a lot on this record inspired by our relationship," Gaga said. "And he’s super supportive of me expressing myself artistically."
WATCH: Lady Gaga Reveals Whether 'Perfect Illusion' Was Written About Taylor Kinney
