Ronda Rousey is not a Belieber (anymore) and it’s all because of the way she claims Justin Bieber treated her 16-year-old sister.

The UFC champ spoke with Cosmopolitan about an incident involving the “What Do You Mean?” singer, during which she said took place at the Cannes Film Festival.

Her younger sister, who she called “very hard to impress,” wanted a photo with Bieber, the only person she cared about being at the film festival.

Rousey explained that when she approached him to ask for a photo, "He was like, 'I've already taken a billion pictures today, OK? A BILLION."

She added, "He walks off and totally snubbed my little sister, and she looks at me, and she's like on the verge of tears, and she goes, 'I'm no longer a Belieber.'"

Rousey added, "I'm not a Belieber” either, “I was, but I'm not anymore."

Rousey made history this week as the first woman to grace the cover of Australia's Men's Fitness magazine.