Justin Bieber, Mark Wahlberg: ‘Don’t Be So Naughty,’ ‘Stop Smoking Weed’

Justin Bieber has been given some timely advice by actor Mark Wahlberg.

The 19-year-old pop prince is rarely out of the headlines these days, albeit at times for inflated reasons.

But, equally it can’t be denied that an astonishing number of incidents both on and off his Believe world tour has led to accelerating speculation that the world’s most famous teenager is either out of control, or going through acute growing pains.

Among the most recent Bieber barnstormers — video footage of him urinating into a mop bucket in a NYC kitchen nightclub, spitting off a Toronto hotel balcony, a third party tour bus drug bust, onstage intimacy with an fan-thrown iPhone, and just days ago, clambering atop a SUV in a Hamptons nightclub parking lot while an altercation took place elsewhere.

Pulling no punches, Wahlberg — who served his time as a pop/rap star in the late nineties — has stepped up again to offer friendly but unsolicited advice to Bieber.

“Justin, are you listening? Don’t be so naughty,” he declared in a live web chat with UK newspaper The Sun.”Be a nice boy, pull your trousers up, make your mum proud and stop smoking weed you little b**tard.”

Referring to his 45 days stint in prison after he plead guilty to an assault charge at the age of 17, the 42-year-old added ominously.

“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.”

The Ted star went on: “He’s a nice enough kid, I met on a number of occasions.You know, you’re gonna be a teenager. But, if you’re being a teenager in the spotlight then you’re going to be criticized for it.

Later he added: “But, this career [it] could be short-lived, so you might as well be your best while you’re doing it, while you’re in the game. And then, after if you want to go f_k off, then go do that.”

Wise words. Wahlberg joins an ever-expanding roll-call of celebrities offering well-meaning advice to the shirtless one, as opposed to vicious, non-constructive snark from Sharon Osbourne.

But will Bieber heed these pearls of wisdom? Wahlberg didn’t share any thoughts on that, but he did reveal the basket-ball movie once slated with the Canadian “still could happen.”

Currently moving through North American dates on his fantastically scrutinized Believe tour, Justin performed in South Carolina last night and is set to play Florida on Wednesday.