During her show on Tuesday, Tay Tay was joined on stage by none other than Nelly. You know, Mr. Country Grammar himself? Oh, and Taylor's besties Haim were there for the singalong, too. #EPIC
T-Swiz shared a few Instagram videos of herself and the Haim girls doing a choreographed dance to the 2002 jam while Nelly rapped the lyrics in front of them. It was pretty much the best thing ever. We're pretty sure they made that ish up backstage before the show. Oh, and they also provided the breathy female backing vocals.
Taylor also sang Nelly's new song "The Fix" with him, easily making his appearance one of her best surprise guests performances ever. Watch them get things all kinds of hot in the clips, below.