Rihanna & Katy Perry vs. Taylor Swift Beef? BFFs 'Plot' MTV EMAs Diss & Revenge, Will 'Totally Embarrass, Mock, Harrass' Pop Rival [VIDEO]

Apparently, "Dark Horse" beauty Katy Perry is currently in a "frenemy" feud with pop princess rival, Taylor Swift. The popular "Shake It Off" songstress recently insinuated that Perry tried "sabotaging" her Red Tour by "stealing" several of her backup dancers. (via Rolling Stone). The 29-year-old "I Kissed A Girl" superstar was not amused, and later tweeted:

@katyperry: "Watch out for Regina George in sheep's clothing..." (Mean Girls reference).

Things have since simmered down... for now.

But according to the infamous gossip webloid HollywoodLife.com, Perry's already plotting her revenge with the help of some friends, including BFF Rihanna.

Rumors suggest that DJ Diplo's supposed girlfriend wants to "crush" 24-year-old Swift at this year's MTV EMAs. An alleged source for OceanUp reveals:

"She and her friends, including Rihanna, are planning on totally embarrassing [Taylor] at the awards in front of the world... They've even said they're just going to talk all the way through her performance and make fun of her dance moves, like Rihanna did to Ariana Grande at the iHeartRadio Awards."

Remember that?

The insider adds, "And if she does try to speak to them and pretend things are OK, they'll walk in the opposite direction, ruining any plans Taylor might have to make it look like it's all fine."

Swift apparently wanted to end this Hollywood "beef," but Perry's not hearing it until she wins:

“She was constantly trying to get in touch with her, so in the end Katy just blocked her number... Embarrassingly, Taylor had no idea and kept on trying, until a mutual friend broke the news. Taylor was fuming, but Katy just finds the whole thing funny.”

Guess fans will have to wait and see... The EMAs air on November 14, 2014.

Perry and RiRi were once "fighting" too (over the "Diamond" songstress' controversial ex, Chris Brown), but now they're close gal pals once again.