Conor McGregor’s opponent hits out at Justin for backing our PRO

Well, it seems like Justin Bieber just found himself in another celebrity feud – and this time it's with UFC fighter Nate Diaz.

Justin decided to share his disappointment about Conor McGregor losing his fight on social media, admitting "that broke me heart" when the Irish fighter was defeated.

He added, "No bandwagon but Conor is a true champion, fights with style and finesse, all the respect to Nate but his style is terrible. Nate has crazy heart respect."

Well, Nate wasn't too happy about the Biebs supporting Conor and totally hit out at him. 

The fighter shared a photo on Instagram of him hitting Justin – in cartoon version – a captioned it "Biebers a hater."

Justin has yet to respond, but judging from his past feuds, there's no doubt he will.