Katy Perry has fallen out with Rihanna over the latter's relationship with Chris Brown, according to reports.
The "Part of Me" singer is said to disapprove of their recent reconciliation and is barely speaking to her 24-year-old former best pal because she thinks Rihanna is "making a huge mistake" by hanging around with Chris, who is still on probation for violently beating her in 2009.
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."
The "Wide Awake" singer was not present at Rihanna's star-studded Halloween bash in Los Angeles last week and opted to attend the Hollywood Forever Cemetery Halloween Party nearby instead, and the "Diamonds" singer was also noticeably absent from Katy's 28th birthday party last month despite being in the same city.
The last time Katy and Rihanna were spotted hanging out together was at the MTV Video Music Awards in September during which Rihanna shared a public peck on the lips with Chris for the first time since their 2009 breakup.
The on-again/off-again couple are rumored to have enjoyed a weekend break together after they both tweeted they were jetting off within hours of one another on Saturday (November 3).
Rihanna wrote on her twitter: "B***h I'm phresh out the runway #UNAPOLOGETIC" on Saturday (03.11.12) shortly before he tweeted a picture of himself and a few friends in front of a private jet.
According to HollywoodLife.com Chris may have invited her to join him for a weekend away before his tour of Europe and Africa starts later this month as the couple have both been extremely busy lately and he wants to do whatever it takes to keep her happy while he is away.
A source said: "[Chris will] miss Rihanna. I know they will talk all day and text back and forth. Then, [he's] going to get back home and have a $5K cell bill. It's cool though. To him, Ri's worth a whole lot more, so he ain't tripping.
"That's his girl and they're talking and trying to squeeze in as much time together as possible before he jets out of here."
Chris—who is due to start his tour on November 14—is due back in Los Angeles today (November 5) to launch his new charity the Symphonic Love Foundation.