Chris Brown causes rift between Katy Perry and Rihanna?

The celeb best friends might have fallen out over him

On US TV show Good Morning America in March 2011, Brown was questioned about his attack on Rihanna. Angered by the interview, Brown smashed up his dressing room backstage and screamed at staff. He later apologised: ''If anybody who was startled in the office, or anybody who was offended I'm disappointed in the way I acted - I got very emotional.'' Adding:"I felt like, 'OK, they told us this just so they can get us on the show so they can exploit me. I kept my composure and did my performances, and when I got back, I just let off, like, steam in the back.''

Monday 5th November 2012 by Grace Carroll | Photos by WENN

Katy Perry has apparently fallen out with BFF Rihanna because of her rekindled friendship with Chris Brown.

According to US reports, Katy disapproves of Rihanna and Chris Brown's reconciliation and is keeping her distance from Rihanna until it's over. It's said that Katy is barely speaking to Rihanna, and she thinks that the 'We Found Love' singer is making a huge mistake.

A source told the New York Daily News, "They're barely talking and ever since the couple reunited, there has been tension between them. Katy has been spending a lot of time with pals Robert Pattinson and Kristen Stewart.

"Katy fears Rihanna is making a huge mistake and doesn't want to be part of it."

Katy wasn't at Rihanna's Halloween party last week, choosing to party at the Hollywood Forever Cemetery Halloween Party instead, and Rihanna didn't attend Katy's 28th birthday party last month - despite the fact that she was in the same city.

Chris Brown arrives at Rihanna's Halloween party dressed as an Arabic militant

Rihanna and Chris were recently spotted at the launch party for his new Qubeey Channel - which is Brown's new customised online channel intended to allow his fans to gain exclusive access to his life.

A source told HollywoodLife.com, "I know it's a lot easier for her to concentrate and work hard now that Chris is back in her life.

"She don't worry about the bullsh*t no more. She don't wonder about what he's doing or who he's with. It's like she feels more secure and confident when he's in her life."

The pair are still not officially together, but were apparently 'hugging and kissing' at the event as well as sharing drinks and a cigarette.

Below, check out Chris Brown's most offensive moments