Along with their ability to sing along to every single one of her hits and school shade-throwers (including John Mayer) on the fact that Taylor Swift is one of the highest-earning musicians in the biz, hardcore Swifties are surely familiar with the singer鈥檚 love of the number 13. Her fondness for the digit stems from the fact that the songstress was born on December 13, 1989, a little known detail which pops up from time to time in various ways.

Taylor Swift

For instance, she writes the number on her hand while on tour and two of her albums, Fearless and 1989, have exactly 13 songs on their track listing. Now, Swift has been spied taking her unusual ritual to Instagram, with eagle-eyed fans taking note.

Just take a look at the post she shared below showing mad love for Lorde鈥檚 new tune鈥

Notice anything unusual? Anything related to the number 13? Yep, you spotted it! Taylor shared the song exactly 13 seconds in. And make no mistake, this was no coincidence 鈥 it鈥檚 something she does on purpose.

Need further proof that this is a *thing*? Here you go鈥

She鈥檚 done it to her bestie Ed鈥

鈥nd Kings of Leon too.

Rachel Platten has been 13-ed.

And just for good measure, here鈥檚 one more.

Chalk it up to just another quirky Swift-ism to add to the growing list of reasons she鈥檚 so endearing to her fans.

Do you have a lucky number? Let us know @BritandCo!

(h/t BuzzFeed, photo via Shirlaine Forrest/Getty)