The 42-year-old-singer-turned-actor, who was jailed for assault as a teenager, also warned the &quot;Baby&quot; hitmaker to stop smoking weed, reports contactmusic.com. &quot;Justin are you listening? Don&#39;t be so naughty, yeah?&quot; he said during a web chat with The Sun newspaper. <img alt="Mark Wahlberg" src="http://images.mid-day.com/2013/aug/Mark-Wahlberg.jpg" style="width: 500px; height: 597px;" /> Mark Wahlberg &quot;Be a nice boy, pull your trousers up, make your mum proud, and stop smoking weed, you little b***h. &quot;He&#39;s a teenager living in a different day and age. I was in prison before I got a record out and I don&#39;t think he&#39;s been to prison. He&#39;s a nice enough kid and you&#39;re going to be a teenager. But if you&#39;re being a teen in the spotlight, you&#39;re going to be criticised for it. <img alt="Justin Bieber" src="http://images.mid-day.com/2013/aug/Justin-Bieber_2.jpg" style="width: 500px; height: 752px;" /> Justin Bieber u00a0 &quot;This career can be short lived - you might as well be the best you can while you&#39;re doing it,&quot; added Wahlberg. Wahlberg is also planning to work with the 19-year-old singer on a film and may even get behind the mike again. &quot;Justin and I were talking about doing a movie, which could still happen. &quot;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,&quot; Wahlberg said. u00a0

Actor Mark Wahlberg has asked pop singer Justin Bieber to be a nice boy and focus on his career.

Bieber be a nice boy, says Mark Wahlberg

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Bieber be a nice boy, says Mark Wahlberg

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