He might want to make up, since Ronda Rousey packs a pretty mean punch!
Last month, the blonde beauty SLAMMED Justin Bieber for being rude to her little sister Julia at the Cannes Film Festival after he refused to take a picture with her.
And based on what the 28-year-old had to say about it, the pop star wasn't very nice regarding the request.
Related: Justin Adds Another 'Evening With Justin Bieber' In LA!
But on Thursday, the MMA athlete said she's willing to let bygones be bygones on one condition:
"He could make it up to my little sister. If she could forgive him, then I definitely would as well."
Alright Biebs, you should probably say Sorry right now, because you won't be on this fierce fighter's good side until you do! She added:
"I'm a protective big sister! If you're going to be mean to my little Julia, then I'm sorry, it's just we are not going to be cool until you fix it."
But, the California native did want to clear one thing up about all the drama, saying:
"I didn't say there was a beef. I was asked, 'would you ever want to hang out with him,' and I said 'no.' He was rude to my little sister!"
That makes total sense, Ronda! We LOVE that you're so protective of Julia!
[Image via FayesVision/Pat Denton/WENN.]