The Sun broke the news that Swift and Alwyn had been secretly dating for months. 

A source told The Sun that the singer flew to see her British beau in London "via private jets and her security has made it a military-like mission to prevent her from being seen."

The outlet also reported, "She's been walking around with Joe in London using disguises, like scarves and hats, to keep her identity under wraps."

Since news of their relationship broke, fans began scouring Swift's songs and music videos for Easter eggs that point to Alwyn.

These clues date back to 2017's "Reputation," which Swift described as "an album about finding love throughout all the noise."

For example, the numbers "89" and "91" appear alongside each other in the "...Ready For It?" music video, released as a single on September 17, 2017.

Swift was famously born in 1989. The second number likely stands for 1991, Alwyn's birth year. At one point in the video, Swift also types "21" into a keypad; Alwyn's birthday is February 21.

A similar detail was noticed in the music video for "Delicate," another single from "Reputation." Swift dances in front of a visible sign that reads "Joe's Deli."

Several songs on the album, including "Gorgeous" and "New Year's Day," seem to reference to Alwyn's British accent and "ocean-blue eyes."

The "Shape of You" singer described Alwyn as a "really, really friendly, really good dude" on Capital London's Breakfast Show.

"They are very much in love, they have quite a low-key relationship, which Taylor likes. It's normal, and no one really knows about it right now," he said.

One month later, Alwyn and Swift watched Sheeran perform at London's Jingle Ball. Fans captured videos of the couple slow-dancing to the song "Perfect."

When Swift recorded a cover of "September" as a Spotify exclusive, she tweaked the first line ("Do you remember the 21st night of September?") to say "the 28th night of September."

For an Easter egg enthusiast like Swift, it's hard to imagine this noticeable switch wasn't meant to send a message. Fans have theorized that September 28 was the day Alwyn professed his love to Swift.

In fact, Swift liked a Tumblr post explaining the theory.

Read more =>  May 2018: Alwyn and Swift share solo shots in the same spot.