Story highlights Taylor Swift surprised the ultimate "Swifty" on Monday, 96-year-old Cyrus Porter

The singer performed "Shake It Off" and hung out with Porter and his family

(CNN) Taylor Swift met a unique fan of hers over the Christmas holiday.

The singer surprised Cyrus Porter, a 96-year-old World War II veteran, at his Missouri home on Monday.

The moment Swift walked through the door, his family erupted into screams and tears.

The pop star posed for pictures and even brought along her guitar for an acoustic rendition of her hit "Shake It Off." Porter, who has 20 grandchildren, sang along with his family.

Porter, who has been to two of Swift's concerts, recently said in an interview with KFVS why he's proud to be a "Swifty."

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