Taylor Swift was a sucker for Olivia Rodrigo's performance of "Vampire" ... debunking any beef rumors between them at the Grammys Sunday evening.
Olivia gave a bloody good rendition of the fiery tune ... with Tay Tay singing and dancing along -- something that didn't go unnoticed on Olivia's end as she blew her a kiss at the end ... signaling a mutual respect between the two.
The "Guts" singer Olivia returned the supportive favor ... standing up to clap for Taylor as she scooped the Best Pop Vocal Album. Yeah, you wouldn't be doing all that for your arch-nemesis, now would you?
The duo's fandom first speculated they were feuding when Olivia retroactively credited Swift and producer Jack Antonoff on her single "Deja Vu" -- though she's denied any clash between them since.