Watch Taylor Swift + Paramore’s Hayley Williams Sing With Chris Carrabba

Over the weekend, at a party hosted by Taylor Swift for her best friend Abigail Anderson's birthday, Dashboard Confessional's Chris Carrabba appeared as a surprise to perform the band's iconic 2003 track, "Hands Down."

And that's not even where the surprises end.

Kings of Leon and Hayley Williams of Paramore were also in attendance ... oh, and Williams sang along with Swift and Carrabba. You can watch a clip below from T-Swizzle's Instagram account:

Dashboard Confessional recently announced a joint tour with Third Eye Blind for this summer, and have also hinted at some new music that could possibly be in the works.

Tay Tay released her latest album, 1989, in October of last year, and has been very vocal about not sharing it via streaming services like Spotify. Her strong stance has urged other artists to stand up for what they feel is fair compensation for their music, and she recently jumped aboard the artist-run Tidal streaming service, already proving that it's contracted to be a bit more generous to its contributors.