The new track is Swift's second song "from the vault" after dropping "You All Over Me" featuring Maren Morris
Taylor Swift
Taylor Swift
| Credit: Kevin Mazur/Getty

Surprise, Swifties!

Ahead of Friday's release of Fearless (Taylor's Version)Taylor Swift dropped the newest "from the vault" single — "Mr. Perfectly Fine (Taylor's Version)."

The upbeat track, which features both country and pop influences, finds Swift singing about a former lover who moved on with a new girl and has no qualms about his prior relationship.

"Hello, Mr. perfectly fine, How's your heart after breaking mine? / Mr. always at the right place at the right time, baby / Hello, Mr. casually cruel, Mr. everything revolves around you / I've been Miss misery since your goodbye, and you're Mr. perfectly fine," Swift croons on the track.

"Me in 2020: life is chill, writing songs based in fiction to avoid drama, feeling pretty grown up. My 2008 music from the vault, in a goblin voice: 'REELEEEEEEASE MR PERFECTLY FIIIIIIINE,'" the pop star tweeted following the song's release.

Swift's surprise release comes just days after she shared the album's official tracklist featuring 27 songs, including "You All Over Me" featuring Maren Morris, "We Were Happy," "Bye, Bye, Baby," "That's When" featuring Keith Urban, "Mr. Perfectly Fine" and "Don't You," which were originally left off Fearless in 2008.

"Here's the full track list, my friends. I'm really honored that @keithurban is a part of this project, duetting on That's When and singing harmonies on We Were Happy," Swift wrote as she shared the tracklist. "I was his opening act during the Fearless album era and his music has inspired me endlessly. I'm counting down the minutes til we can all jump into this brave world together, filled with equal parts nostalgia and brand newness."

"Head first, Fearless 💛," she ended.

The tracklist release came after she sent her fans into a social media frenzy with a cryptic video she shared on Twitter. In the clip, a series of scrambled letters came out of an animated gold vault as mysterious music played in the background.

She wrote in her tweet, "The vault door is about to be as unhinged as you'll think I am after you watch this video," she wrote. "Level: Expert. Happy decoding!"

RELATED VIDEO: Taylor Swift Drops First 'From the Vault' Song 'You All Over Me' Ahead of Re-Record of Fearless

Earlier this month, Swift released "You All Over Me (From the Vault)" featuring Morris, 30.

It marked the first of the six new tracks that will appear on Fearless (Taylor's Version).

Ahead of the tune's release, the "Cardigan" star wrote, "HI. I wanted to let you know that the first 'From the Vault' song I'm releasing from Fearless (Taylor's Version) comes out tomorrow at midnight eastern. It's called 'You All Over Me (From The Vault)."

Fearless (Taylor's Version) will feature re-recordings of 20 songs from Swift's sophomore album Fearless. Former Nashville record company Big Machine Label Group (where she first signed at age 15) previously owned the rights to the album following its Nov. 11, 2008 release.