Justin Bieber has issued an apology to Ronda Rousey for allegedly blowing off her little sister.

The 28-year-old mixed martial arts champion accused the 21-year-old {Sorry} singer of snubbing her 17-year-old sibling after the teenager asked for a photograph with him at the {Cannes Film Festival}.

While speaking to TMZ in November (15), Ronda made it clear she believes Justin owes her younger sibling an apology, stating: “He could make it up to my little sister. If she could forgive him, then I definitely would as well. I’m a protective big sister. If you’re going to be mean to my little Julia, I’m sorry then it’s just we’re not gonna be cool until you fix it.”

Justin claims he didn't mean to be rude and the musician said he was sorry during an interview with Elvis Duran that airs on Entertainment Tonight on Wednesday 18 November (15).

“I guess, supposedly, she asked for a picture with her sister or something, and I guess I said no?” Justin said. “But I don’t remember this happening so, Ronda, I’m sorry. Don’t kick my a*s!”

Within moments Justin changed his tune after he was asked what hobbies he'd like to explore outside of music.

The pop star joked he might become a fighting contender like Ronda one day, but his answer also called attention to her humiliating defeat at the hands of Holly Holm, which took place during the UFC 193 match in Melbourne, Australia on Sunday 15 November (15).

“I would like to get better at boxing .?.?. Did you see Ronda Rousey?” he asked, referring to the Rousey vs. Holm fight. “She got knocked out cold! Oh my God, she got knocked out so bad. Yeah no, she got pummeled.”

Justin closed out the talk with his vision for the future, noting he will "hopefully have a family, a wife, some kids .?.?. an indoor basketball court and an indoor pool.

“I want to build it and stuff, and find the right place," he detailed.