Internet sleuths are pretty sure the mysterious William Bowery Swift thanked on Twitter is actually her boyfriend.
When Swift announced on Thursday morning that she would be dropping her surprise eighth album at midnight, she thanked songwriters Aaron Dessner, Jack Antonoff, Bon Iver, and someone named William Bowery.
Fans were quick to notice that Bowery was the only one whom Swift didn't tag, and some dedicated detectives discovered that there are no registered songwriters or producers named William Bowery.
So, going off the theory that William Bowery was a pseudonym for someone else, fans began to investigate deeper.
As it turns out -- according to fans and some paparazzi photos -- Swift and Alwyn were spotted outside the Bowery Hotel in New York City back in 2016, toward the start of their romance.
Fans searched Alwyn's Wikipedia page, which reveals that he is the great-grandson of English composer and musician William Alwyn. Hence, according to their theories, William Bowery is actually Joe Alwyn.
While it might strike some as odd that Swift would hide her boyfriend's identity, the singer has proven that she enjoys getting fans to play along with hidden clues.
In fact, she even told fans that, for Folklore, she "put Easter eggs in the lyrics" and not just the music videos.
So while it's not necessarily "confirmed," as so many fans have excitedly declared on Twitter, the theory does have its share of circumstantial evidence.
For more on Swift and Alwyn's low-key romance, check out the video below.