NATE DIAZ TO BIEBER ‘SHUT YOUR BITCH ASS UP’

Justin Bieber is in a brand new celebrity feud … with UFC superstarNate Diaz!!!

Here’s the deal … after the fight, Bieber praisedConor McGregor on social media — posting a photo of the guy with the caption, “Still the champ.”

Then he posted video of a toast he made to Conor saying, “To McGregor. He’s still the champ. That broke my heart.”

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.”

So, how did Nate Diaz react???

He posted a image on Instagram showing him slapping Bieber in the face with the caption, “Shut your bitch ass up.”

He added the caption, “Bieber’s a hater.”

Your move now, Justin …

TMZ