MGK‘s show in Rosemont, Illinois, on Thursday night was part concert, part friendship love fest, with Halsey surprising the crowd by joining her longtime pal on stage for an electric performance of “Bad Things.”

At one of the final 2025 dates of the rapper-turned-rocker’s Lost Americana tour, the pop star came out for an unexpected duet on MGK’s nine-year-old Billboard Hot 100 hit “Bad Things.” “Am I out of my head? Am I out of my mind?/ If you only knew the bad things I like,” Halsey sang, taking over Camila Cabello’s part on the song. “Don’t think that I can explain it/ What can I say? It’s complicated.”

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