Tay welcomed Mick Jagger to the stage with her, and gram went nuts. She's apparently a huge Rolling Stones fan and was at T-Swift show with her granddaughter. Don't worry, she's a Swiftie, too.
"The tickets were purchased a year in advance, not even knowing about special guests. My mom has had a lifelong dream of going to a Stones concert, but due to a serious health issue this past year she missed their tour," the description of the video reads. "It was upsetting to her and a big disappointment."
We weren't the only ones who thought this was the cutest concert moment ever. Taylor even Tweeted about grandma.
Why I like bringing out surprise special guests on tour: http://t.co/jSZNIJstRP— Taylor Swift (@taylorswift13) September 27, 2015