Mark Wahlberg warns bad boy Bieber

Mark Wahlberg has warned Justin Bieber to "stop smoking weed" and focus on his career. Mark Wahlberg has warned Justin Bieber not to "be so naughty." The singer turned actor - who was jailed for assault as a teenager - warned the 'Beauty and a Beat' hitmaker to stop smoking cannabis and focus on his career. During a webchat with The Sun newspaper, he joked: "Justin are you listening? Don't be so naughty, yeah? "Be a nice boy, pull your trousers up, make your mum proud, and stop smoking weed, you little b***h." On a more serious note, Mark, 45, added: "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." Mark - who rose to fame as the leader of pop group Marky Mark and the Funky Bunch - is also planning to work with the 19-year-old heartthrob on a film and may even get behind the mic again for the soundtrack. He said: "Justin and I were talking about doing a movie, which could still happen. "We have a great script which could be a vehicle for him to make his debut in movies, then maybe we could do something for the soundtrack."