Ronda Rousey changed her mind in being a fan of pop star Justin Bieber because the young actor snubbed her little sister by refusing to take a picture with her.  

The mixed martial arts champ revealed in a video what the Canadian pop star did to her 17-year-old little sister who is an avid fan of the star.

Rousey said:' Justin Bieber was actually really rude to my little sister at the Cannes Film Festival.'

The 28-year-old UFC Bantamweight Champion Ronda said that her sister Julia got excited upon seeing Beiber, 21, taking pictures with his fans so as an older sister she assured Julia that Beiber would take a photo with her. She described her sister to be 'very hard' to impress.

'I walked over there, I said ''Excuse me'' and he turned to me and goes ''I've already taken a billion pictures today OK'' and I said ''Yeah but'', Rousey explains.

'I only got ''Yeah but'' out and he goes, ''a BILLION'' and walked off,' She said.

After the incident Rousey said that her tearful sister right away withdrew to be a Belieber.

'Yeah, I don't think I'd want to hang out with him. I'm not a Belieber. I was, but I'm not anymore,' she added.

Rousey was a guest on The Tonight Show with Jimmy Fallon on Tuesday night wearing a black dress with a plunging neckline.

The champion has been making media appearances to endorse her forthcoming UFC Women's Bantamweight Championship battle in opposition to Holly Holm in the following month in Melbourne, Australia.

70,000 numbers of crowd is expected in her November 15 championship in Melbourne's Etihad Stadium.

While the champ has been training for her upcoming fight, Bieber was spotted in Bora Bora on Tuesday relaxing amidst numerous controversies going for a swim with his 20-year-old love interest Pierce.