Rose Marie Fagan was screaming just as loud as any teenage girl at this Taylor Swift concert, when the Blank Space singer welcomed Mick Jagger to the stage.

The 72-year old accompanied her daughter-in-law and granddaughter to Swift's Nashville show, and tells WHAM-TV that Taylor teased throughout the show that she'd be bringing out a surprise guest, and she knew it would be someone big. Fagan couldn't contain her excitement when that guest turned out to be Jagger.

Watch Grandma's delightful reaction below.