Bieber mouths off during court grilling

Justin Bieber behaved like a spoiled, entitled little brat as he was being grilled in a lawsuit over his bodyguard.

The puny pop star sighed, rolled his eyes and seemed irritated at having to answer any questions about his hired muscle, who allegedly roughed up a photographer, according to footage posted by TMZ today.

• He was combative, telling an opposing lawyer: “I don’t have to listen to anything you have to say.”
• Bieber was sarcastic: “I don’t know if I’ve ever been to Australia. Have you ever been to Australia?”
• He giggled like a schoolboy after being asked if he had ever “disciplined” his bodyguard: “Disciplined, what kind of question is that? Is he my son?”
• The pop star also came off sexist, calling an opposing lawyer Katie Couric: “Well, I don’t know, Katie Couric, you tell me.”

But Bieber wasn’t laughing when he was asked about former flame Selena Gomez.

Lawyers for the plaintiff asked Bieber if he knows Gomez — and if they ever talked about their dealings with photographers.

Then, with a stone-cold, angry glare, Bieber said: “Don’t ask me about her again.”

As his lawyers and the photog’s attorneys jostled over the question’s relevance, Bieber kept repeating the line.

He said, “Don’t ask me about her again,” six times in total before both sides called for a break.

Bieber and Gomez have been on-again, off-again for years. They were last reported to be off-again early last year.

This videotaped deposition was marked March 6.

Bieber also seemed to resent being asked about the role Usher played in his career. The performer and producer Usher is widely credited with developing Bieber into the mega-star he is today.

When a lawyer asked if he knows Usher, Bieber was oddly nonchalant: “Yeah, Usher. That sounds familiar.”

Then, when asked directly if Usher discovered him, Bieber took all that credit himself — with a hilarious vocabulary slip-up.

“I was found on YouTube,” he said. “I think I was detrimental to my own career.”

One of the pop star’s lawyers could be heard in the background saying that he meant to say “instrumental.”