That's right, the digits of the date add up to the number 13. To understand why this is such a big deal, let's look at what 13 means to the singer, who considers it to be her lucky number.

As Swift explained to MTV back in 2009, she has long been drawn to the number for quite a few reasons, starting with the fact that she was born on December 13, 1989. "I was born on the 13th," she said. "I turned 13 on Friday the 13th. My first album went gold in 13 weeks. My first #1 song had a 13-second intro. Every time I've won an award I've been seated in either the 13th seat, the 13th row, the 13th section or row M, which is the 13th letter."

Coincidence? Swift thinks not. "Basically whenever a 13 comes up in my life, it's a good thing," she said.