There's so much talk about Katy Perry vs. Taylor Swift these days that it's easy to forget the current queens of pop aren't the first to wage all-out war against one another.

That honor probably belongs to a couple greasy-haired dudes who got in a fight backstage at The Ed Sullivan Show, but who cares about them?

We want to rewind a bit, but not all the way back to the days when people paid money for music, like freakin' barbarians.

This story takes us back to the early 2000s, a time when many Americans innocently thought we'd elected the biggest jackass president this country would ever know.

In 2001, Pink, Christina Aguilera, Lil Kim, and Mya all collaborated on a cover of "Lady Marmalade" for the soundtrack to Moulin Rouge, aka The One Where Nicole Kidman Tried to Sing.

Apparently, the former two got into a disagreement about who would sing what part, and there was very nearly a physical altercation.

Pink has since attained the status of living legend, while Christina spent some time on that show with the spinning chairs.

Anyway, Pink appeared on Watch What Happens Live last night, where she told Andy Cohen about the time that Christina tried to punch her:

“We were super young and super new at the whole thing, and I think I’m an alpha, and she’s an alpha,” she said during the show's "Plead the Fifth" segment.

“I’m used to taking my altercations physical and she’s used to having them verbal. We’re just very different, we’re very different. And we were very young and new.”

Unable to suppress laughter, Pink added:

"She swung on me in a club. Hilarious ... I was like, 'What's happening?'"

Pink says she and X-tina are "fine" these days, which is something Aguilera should be very happy about.

That would've been a severely one-sided fight.