Rihanna's tearaway week, which involved being late for a Birmingham gig then jetting to Amsterdam and smoking drugs, has left Beyoncé reeling.
Bey's hubby Jay Z discovered Ri, 25, and his company manage the star, so we're told Bey's had a stern word with her husband.
"Beyoncé's had it with Rihanna. She thinks she's totally out of control," says our insider.
Even her outfit choices cause a stir - remember that, ahem, self pleasure T-shirt she wore?
However, defiant Ri couldn't give a monkeys what people are saying about her, and had a bit of a rant online recently, saying she's never wanted to be a role model.
Either way, we're not surprised that mum-of-one Beyoncé, 31, is hoping Ri will tone things down!
Read the full story on Bey and RiRi's clash in this week's Reveal, it's out now.
Watch Rihanna's music video for 'Diamonds' below: