Fans attending the Dallas stop of Taylor Swift's Reputation Tour Friday night (Oct. 5) got a big surprise when one of their hometown own — Arlington, Texas' Maren Morris — joined Swift on stage for a duet of Morris' hit "The Middle."

Swift introduced Morris in glowing terms:

" I think I can safely categorize myself as a superfan of this artist," she told the crowd. "I listen to [Morris' Hero album] over and over and over, and I can't wait to see what she does next."

Swifties seemed thrilled to see Morris, and the superstar herself continued the praise later on her social media. "So so grateful this happened," Swift wrote. "I was so happy I was really just bopping like an 8 year old alone in my room."

Morris gushed in return, posting on her own accounts: "I look up a whole lot to how you've made a career and I hope to someday achieve even a percent of what you've so gracefully cultivated ... you know no boundaries, and that's what music should be about."

Morris also posted a photo of the two rehearsing before the show, marveling, "Did we just become best friends?" That would certainly be a friendship to keep eyes on!

The Dallas stop, which plays an additional night Saturday, marks Swift's final North American dates before heading to Australia. Morris is currently working on her sophomore album. "The Middle," which came out in January, is a collaboration with DJ/producer Zedd alongside electronic duo Grey, which gained Morris a No. 1 single on the dance charts.

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