Taylor Swift + Ed Sheeran Perform ‘Everything Has Changed’ at Madison Square Garden [VIDEO]

Ed Sheeran was joined onstage at Madison Square Garden on Nov. 1 by none other than this BFF and onetime Red tourmate, Taylor Swift! And he couldn't be happier about it.

"There's a few reasons why I'm here tonight," Sheeran began. "One of those things is I played a pretty nice number of big shows ... I was opening up for a really good friend of mine," he said. "Being in America the last couple of months, I've seen amazing things, I've written some songs, done wonderful things -- and I owe it to someone. New York, let's make a lot of noise right now for Ms. Taylor Swift!"

Swift emerged onto the stage with a guitar, wearing an "I

The duo then launched into 'Everything Has Changed,' complete with Swift's awkward interpretive dancing, slightly offbeat clapping and smug smile -- she's clearly very proud of her pal.

NEW YORK, NY - NOVEMBER 01: Taylor Swift joins Ed Sheeran on stage at his sold-out show at Madison Square Garden Arena on November 1, 2013 in New York City. (Photo by Anna Webber/Getty Images for Atlantic Records)

NEW YORK, NY - NOVEMBER 01: Taylor Swift joins Ed Sheeran on stage at his sold-out show at Madison Square Garden Arena on November 1, 2013 in New York City. (Photo by Anna Webber/Getty Images for Atlantic Records)