Not only is December 13 her birthday, but the number has career significance too.

Taylor Swift has been seen around London lately with the number 13 drawn on her hand. For some people, that number might represent bad luck, but for Swift it has only ever meant good things. She recently opened up about her love for the number 13 and has credited it with many of her successes in the last few years.

“The significance of the number 13 on my hand … I paint this on my hand before every show because 13 is my lucky number; for a lot of reasons,” she explained. “It’s really weird.”

Not only is it the day she was born on in December 1989, but over the years it has become so much more. “I was born on the 13th. I turned 13 on Friday the 13th. My first album went gold in 13 weeks. My first #1 song had a 13-second intro,” she said. “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.”

Some may chalk all of that up to coincidence, but Swift assures everyone that the number can only mean something fantastic will happen in her life. “Basically whenever a 13 comes up in my life, it’s a good thing.”