In a 2am surprise (around 7am UK time), the 34-year-old announced on social media that The Tortured Poets Department includes a second instalment.

She wrote: "It's a 2am surprise: The Tortured Poets Department is a secret DOUBLE album. I'd written so much tortured poetry in the past 2 years and wanted to share it all with you, so here's the second instalment of TTPD: The Anthology. 15 extra songs. And now the story isn't mine anymore… it's all yours."

Update:
What do her new lyrics mean?

It's the superstar's 11th studio album and features a bumper 31 songs spilling over two hours.

Swift announced details of the record in February this year when she won the Grammy Award for Best Pop Vocal Album for Midnights.

At the time, she revealed the new album includes collaborations with Post Malone and Florence + The Machine who feature respectively on the tracks Fortnight and Florida!!!.

Swift is believed to have included songs about her break-ups with British actor Joe Alwyn and The 1975 star Matty Healy in the album, while a song full of American football references is thought to be inspired by her latest romance with NFL star Travis Kelce.

Read more:
Boyfriend hails 'unbelievable' album

The 15th track, The Alchemy, appears to be a nod to her relationship with the Kansas City Chiefs star with references to American football terms including the team, warm benches, winning streak, and trophy, and also features the line: "So when I touch down, call the amateurs and cut 'em from the team."

She began dating the athlete last year and her attendance at the Super Bowl made headlines around the world, including that kiss with Kelce after the Chiefs' victory.

Kelce, who has recently landed a role as host of the game show Are You Smarter Than A Celebrity?, said he listened to parts of the album and said it's "unbelievable".

Analysis:
Marriage, babies, break-ups - breaking down the album

So Long, London is number five in the tracklist - the slot reserved for the most meaningful song on each of Swift's albums - and is thought to offer new insight into her split with The Favourite actor Alwyn after six years together.

In the lyrics, Swift hints at wedding plans, singing: "You swore that you loved me but where were the clues, I died on the altar waiting for the proof" - as well as being upset at having to leave London which she said she "loved".

The very title of the album may be referring to a WhatsApp group Alwyn previously set up with fellow actors Andrew Scott and Paul Mescal, called The Tortured Man Club.

On Healy - who Swift dated for a few weeks last year after her split with Alwyn - several songs seem to reference him, including on Guilty As Sin, where she sings about having "fatal fantasies" for someone from her past while in a relationship.

Writing songs about past old flames is nothing new for Swift including Joe Jonas (Mr Perfectly Fine), Harry Styles (Style), Jake Gyllenhaal (All Too Well) and John Mayer (Dear John).

The singer posted the significance of the album on X as a flurry of fans commented their love for it.

Swift wrote: "The Tortured Poets Department. An anthology of new works that reflect events, opinions and sentiments from a fleeting and fatalistic moment in time - one that was both sensational and sorrowful in equal measure.

"This period of the author's life is now over, the chapter closed and boarded up. There is nothing to avenge, no scores to settle once wounds have healed. And upon further reflection, a good number of them turned out to be self-inflicted.

"This writer is of the firm belief that our tears become holy in the form of ink on a page. Once we have spoken our saddest story, we can be free of it. And then all that's left behind is the tortured poetry."

Other songs on the compilation include The Smallest Man Who Ever Lived, The Prophecy and Cassandra, while the bonus song is titled The Manuscript.

Swift's sold-out Eras tour makes its way to the UK on 7 June, starting with three shows in Edinburgh.

The run of her London shows begins on 21 June.