Mark Wahlberg has branded Justin Bieber a "naughty...little b**tard" and warned the young star to "stop smoking weed".

The 2 Guns actor, who also found fame as a teenager, urged Bieber to "be the best [he] can" and "make [his] mum proud" while he is still a success.

Michael Sohn/AP

Speaking during a webchat with The Sun, Wahlberg declared: "Justin, are you listening? Don't be so naughty, yeah?"

Addressing reports that marijuana had been found on a bus associated with Bieber's entourage, he continued: "Be a nice boy, pull your trousers up, make your mum proud and stop smoking weed, you little b**tard.

"He's a teenager living in a different day and age. I was in prison before I got a record out and I don't think he's been to prison.

"He's a nice enough kid and you're going to be a teenager, but if you're being a teen in the spotlight you're going to be criticised for it. This career can be short-lived - you might as well be the best you can while you're doing it."

Wahlberg also revealed that he and Bieber are planning to make a film together.

"Justin and I were talking about doing a movie, which could still happen," he said.

"We have a great script that could be a vehicle for him to make his debut in movies, then maybe we could do something for the soundtrack."

Bieber yesterday (August 5) denied reports that he ripped off his shirt and "went nuts" during a night out in New York, allegedly sparking a fight between his entourage and club patrons.

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