Justin Bieber 'Shunned' by Mark Wahlberg: 'Stop Smoking Weed and Pull Your Pants Up Little Bastard!' Actor Offers Selena Gomez's 'Naughty' Ex Blunt Advice

Mark Wahlberg has a loud message for pop megastar Justin Bieber - "Pull your pants up and stop smoking weed, you little bastard!"

Sound advice coming from the former Marky Mark & The Funky Bunch troublemaker.

In a recent live web chat with Britain's The Sun, the 42-year-old actor had some rather harsh (but true) words for the Biebs:

"Justin, are you listening? Don't be so naughty ... Be a nice boy, pull your trousers up, make your mom proud and stop smoking weed you little bastard. 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 criticized for it. This career can be short-lived - you might as well be the best you can while you're doing it."

Wonder if the "Believe" crooner will take Wahlberg's advice to heart? Maybe he should, before he finds himself in even more trouble...

Wahlberg knows what it's like being a teen idol... and despite some minor setbacks, he's turned out just fine.Hopefully the same goes for the Biebs!