Taylor Swift carried out a Christmas miracle on Monday when she visited the Missouri home of 96-year-old WWII veteran Cyrus Porter after learning he was her oldest fan. The moment Swift walked through the door, his family erupted into screams and tears. Swift surprised Porter and 60 of his relatives with a performance of "Shake it Off" and several of her other hits for a more-than one hour private show. Porter's grandchildren shared pictures of Swift's visit on social media.