Katy Perry’s long-running feud with Taylor Swift may (temporarily) be over since she is SHADING Rihanna these days!

Welcome to high school all over again! Read on to see why American Idol’s lackluster judge Katy Perry is now SHADING her “bestie” Rihanna???

CelebNMusic247.com has some new tea spilling on Katy Perry who apparently goes through friend like fashion going out of style.

We wish were on that red carpet when these two ladies were forced to pose for cams because the photo says so much.

We wonder what they were saying under their breath while smiling?

According to the tabloids, The fallen angel Gabriel aka Katy Perry made sure that The Pope of Fashion Rihanna was excluded from her Met Gala after party on Monday.

Nooo, The SHADE of it ALL, but let’s NOT forget what Keely Hill of Love & Hip Hop Atlanta said, “in the music industry there are no real friendships.”

DAMN, It appears, Keely is right because Katy seems to follow that “Hollywood Friend” thing real close when it comes to Rihanna!

According to The Sun, Rihanna didn’t put Katy on the list for her event at Up&Down in New York following the star-studded ball, and then came that AWKWARD MOMENT when RiRi and Katy were FORCED to pose on the red carpet beforehand!

Now, a source is spilling tea to the tabloid magazine:

Because Rihanna was chairing the Met Gala, she had to pose with a lot of the celebrity guests but it was really uncomfortable when she was asked to have the photo with Katy. They used to be close but Rihanna’s expression in the photo says it all. Katy was upset about the whole situation because Rihanna was cold to her and she wasn’t invited to her after-party.