She was the musical guest on SNL, then made a last minute appearance on The Tonight Show with Jimmy Fallon. It was actually the first episode since his mom's passing and a line in the song she performed had very special meaning to Jimmy. He had told the story of his mom holding his hand and squeezing it three times to say "I love you", and Taylor says the same thing in the song. Check it out!
Also, how awesome is it seeing Taylor and her backup singers bust out that choreography?!