'No longer a Belieber': Ronda Rousey and her little sister snubbed by 'very rude' Justin Bieber

You don't want to mess with Ronda Rousey. The fighting champ is the latest celeb who's gotten the sudden urge to smack Justin Bieber in the face…except in this case, she could actually cause some serious damage.

Speaking to Cosmopolitan, the 28-year-old recalled the time Biebs shot down her request for a photo at the Cannes Film Festival. Check it out, above. The worst part? The pic was for her 16-year-old sister Julie, who was a huge fan. Key word: was.

Having recently toured Australia, Justin was papped in Bora Bora this week…totally naked!

Wandering his private villa with robe-clad British model Jayde Pierce, 20, the 21-year-old singer let it all hang out in the photos attained by NY Daily News.

Practicing Beliebers jumped to their almighty deity's defence, claiming that the photos were an invasion of privacy and starting the hashtag #RespectJustinsPrivacy.

And…well…they've got a point. If unconsenting nude photos of Selena Gomez or Taylor Swift were plastered all over the internet, s--- would hit the fan.

Meanwhile, Biebs is back in LA, probably celebrating his number one single by taking a super naked bath in vintage Dom Pérignon…we'd imagine.