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It's time to take this beef off the grill!

But first, Katy Perry needs to explain her side of the "situation" with Taylor Swift!

In Monday night's Late Late Show Primetime Special, James Corden took a spin with the pop superstar and jammed out to her hits like Firework, Roar, and Bon Appetit.

After singing Perry's new single Swish Swish -- her purported response to Swift's 2015 diss track -- the late night host straight up asked about the long-reported feud between the two pop singers.

Related: Katy Is Making BANK For American Idol!

And maybe it was just the intimacy of Carpool Karaoke, but Katy Kat went all in sharing her side of the story -- which included a message that Tay-Tay should finish what she started!

While she didn't directly confirm Swish Swish is about her feud with Taylor, Katy confessed the beef started with her backup dancers pulling out of Swift's tour early to join hers.

Feeling bad about the "fumble," Katy admitted she tried to smooth things out between the two, but by that point she was already lyrical fodder for the Style singer. She explained:

[Image via CBS/YouTube.]