The 28-year-old singer surprised the crowd at Rogers Centre in Toronto, Canada, on Saturday, when she brought out Bryan Adams for a spirited rendition of his 1985 classic, "Summer of '69."
Following the show, Swift took to Instagram to marvel over the incredible performance, revealing to her fans that the collaboration actually happened at the last minute.
"I didn’t even know Bryan was gonna be in town until last night and I asked him completely last minute if he wanted to come sing!!" she explained. "Pretty evident from the videos (um yes I'm posting another one) that I'm FULLY LOSING IT with excitement, and I can't thank @bryanadams enough ✨⭐️?."
"My photo of @taylorswift showing me the under-stage slide to the trap door," another post read. "Thanks Taylor, I’m not sure I’d have gone that way if ya hadn’t shown me! #taylorswift #fendertelecaster."