MTV VMA's 2012

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Rihanna at the Met Ball 2012.

Rihanna looked stunning in a gown by Tom Ford. 13 Photos »

Katy Perry Films 'SNL'

Katy gets her funny on with Matt Damon and Andy. 20 Photos »

Check yaself, Katy

Perry stole Rihanna's thunder. 27 Photos »

View the Gallery / 6 Photos »

Rumor has it that Katy Perry and Rihanna are on bad terms since the latter has started to make nice with Chris Brown.  A source told New York Daily News on Sunday that the girls are “barely talking.”

Much like everyone else on planet earth, Perry reportedly feels that “Rihanna is making a huge mistake and doesn’t want to be part of it.”

Instead of going to Rihanna’s Halloween party at Greystone Manner in West Hollywood last Wednesday night, Perry dressed up as Jane from MTV’s Daria and hung out with Kristen Stewart at LA’s Hollywood Forever Cemetery.

Duh. 

chris brown attends rihanna's halloween party

15 Photos »

Rihanna confirmed via Twitter that she’ll duet with Brown on her upcoming album, Unapologetic (out November 19th).

It’s like high school all over again