The 25-year-old entertainer brought out Rachel, 34, to sing a duet of her hit track “Fight Song.” Watch below!
“…and I’ve still got a lot of fight left in me. @rachelplatten #1989TourPhilly,” Tay captioned an Instagram photo of them.
Meanwhile, Mariska Hargitay joined Taylor on stage for the second night in a row as she sang “Style.”
“Everyone screamed so loud when @Mariska came out during Style, I’m considering just taking her on tour with me. #QueenMariska #Justice,” Taylor tweeted.
Taylor Swift & Rachel Platten Sing “Fight Song” in Philly 6/13/15
15+ pictures inside of Taylor Swift performing in Philly for the second night… More Here! »