AceShowbiz -

Another song from Taylor Swift's "Red" album has made its way out online. The unofficial audio features her and Ed Sheeran performing their duet "Everything Has Changed" during what seems to be a live recording of an acoustic jam session.

"All I know is we said hello/ And your eyes looked like coming home/ All I know is you said my name/ And everything has changed," the two sing the chorus of the guitar-driven ballad together. "All I know is you held the door/ You'll be mine and I'll be yours/ All I know since yesterday is/ Everything has changed."

Swift and Sheeran's duet was written in her backyard. "We were just talking about the feeling of when you first meet someone and all of a sudden the way that the world looks to you changes," she said of the song. "Like everything looks different to you because of this one person, because one new person came into your life. It's really cool."

As for how the collaboration came about, the "Begin Again" songstress revealed, "I had management reach out and at the same time he was having his management reach out to me because we both wanted to work together at the same time."

"Red", where "Everything Has Changed" will appear, will officially come out October 22 Stateside, but the full set has now leaked online. Its first single "We Are Never Ever Getting Back Together" debuted atop Billboard Hot 100 upon its release, making it Swift's first No. 1 single on the chart.