It was a sweet surprise for Taylor Swift’s loyal fans after the singer released a teaser of a new music video which is directed by no less than her close friend, Blake Lively.

The Grammy winner posted the 10-second teaser clip on her Twitter page Sunday and captioned it, “Surprise! new music video tomorrow at 10 a.m. ET finally go to work with the brilliant, brave & wickedly funny @blakelively on her directorial debut. Join us as we raise a toast, and a little hell.”

Lively reposted the same clip on her Instagram page and wrote, “Tomorrow. 10am ET.”

Clicking the link at the tweet leads to the YouTube page of the music video of “I Bet You Think About Me” (Taylor's Version) (From The Vault) (Official Video). It is set to be shown on 10 a.m. Monday, according to Swift and Lively. Nearly 3,000 people have set their reminders for the premiere of the music video.

The teaser video features a cake with pearly white icing being scratched by a hand adorned with red nail polish and a red ring. The end of the clip reveals Swift and Lively as writers of the video and Blake as the music video’s director.

“I Bet You Think About Me” is a song previously written by Swift which did not make the cut on the original 2012 “Red” album. Swift re-recorded the “Red” album which dropped last Friday. Chris Stapleton is also featured in the song, as per E!

Lively, 34, is known for her roles on “Gossip Girl” and in the movies “Simple Favor” and “The Age Of Adaline.”

The actress and her husband “Free Guy” star Ryan Reynolds were spotted at the after-party event of “Saturday Night Live” where Swift promoted her newly-released “Red” album. The new version of Swift’s 2012 album has 30 tracks compared to the original’s 16 tracks.

A Twitter user posted a snap of Swift, Lively and Reynolds arriving at the glitzy event Saturday.

“Sadie sink with taylor swift, ryan reynolds and blake lively arriving at the snl afterparty ,” the twitter user wrote.

In the photo, Reynolds wore grey slacks and a white button-up shirt and a navy suit and tie to the event while Lively sported a navy, body-hugging dress with a sexy cut on her chest. Swift, on the other hand, donned a houndstooth-patterned coat on an all-black outfit. The trio wore masks in the snap.

Taylor Swift won the Album of the Year award for 'Folklore' at this year's Grammys
Taylor Swift won the Album of the Year award for 'Folklore' at this year's Grammys The Recording Academy / Kevin Mazur