This Huge Secret About Taylor Swift Just Got Out–We’re So Surprised!

In May, Swift shared a cover of her song "Look What You Made Me Do" that was featured in the "Killing Eve" soundtrack.

At the time, the singer shared the cover on Twitter along with a message: "VERY STOKED about this cover of lwymmd on @KillingEve by Jack leopards & the dolphin club!!"

However, fans were quick to point out that no one has heard of  "Jack Leopards & The Dolphin Club."

Plus, this Swift cover is apparently the only song credited to them.

That's not all. One of the listed producers of the cover is Nils Sjoberg, a pseudonym Swift previously used when she worked on the song "This Is What You Came For" with then-boyfriend Calvin Harris.

Some fans are even speculating that the singer behind the cover could be Swift's brother, Austin. According to Daily Mail, this theory is not out of the question. Apparently, Swift had previously spoken to Phoebe Waller-Bridge, the show's executive producer, about her brother doing a song for "Killing Eve."