E! News can exclusively reveal that the "22" Grammy winner will be Ed Sheeran's guest performer during his concert at Madison Square Garden in New York City.
The British singer-songwriter invited Swift to join him on stage when he found out she would be in New York today promoting her new holiday collection for Keds. "He's one of my best friends," Swift told E! News' Alicia Quarles this morning at the Keds showroom.