So here's what happened: Ronda attended this year's Cannes Film Festival with her 16-year-old sister, Julia. Being a teenager, Julia got super excited when she saw that Justin Bieber was also there, but she was too afraid to ask for a picture with him. Because Ronda is probably the best big sister ever, she went over to ask Justin on her sister's behalf.
Justin responded in typical Bieber fashion: by acting like a complete douchebag. "I walked over there and I said, 'Excuse me,' and he said 'I've already taken a billion pictures today,'" Ronda told Cosmopolitan. "And I said 'Yeah, but' – because she was the only 16-year-old girl at the whole party – and I only got 'Yeah, but' out, and he goes 'A billion' and walks off."
Nice one, Bieber. Needless to say, neither Ronda nor her sister are Beliebers anymore. Julia was actually near-tears because of the incident.
Justin may be BFFs with Floyd Mayweather, but he better watch his back. If Ronda ever decides to start throwing punches outside of the octagon, no one will judge her for starting with the guy who made her little sister cry.
Check out the video of Ronda telling the full story below.