The &#39;Baby&#39; singer has hit the headlines for all the wrong reasons in recent months for his increasingly bizarre behaviour, and Wahlberg is hoping the 19-year-old will follow his example and turn his life around, reported Contactmusic. <img alt="Mark Wahlberg and Justin Bieber" src="http://images.mid-day.com/2013/aug/Mark-Justin.jpg" style="width: 500px; height: 378px;" /> Mark Wahlberg and Justin Bieber Wahlberg served 45 days in prison after pleading guilty to an assault charge at the age of 16, and the actor swears the conviction was a turning point in his life. &quot;Justin, are you listening? Don&#39;t be so naughty... Be a nice boy, pull your trousers up, make your mum proud and stop smoking weed. 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. &quot;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. This career can be short-lived - you might as well be the best you can while you&#39;re doing it,&quot; he said. Wahlberg was previously in talks to work with Bieber on an acting project, but the basketball-themed movie was put on hold following setbacks.u00a0

Actor Mark Wahlberg has warned teen superstar Justin Bieber to clean up his act and behave more appropriately. 

Mark Wahlberg warns Justin Bieber to clean up his act

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Mark Wahlberg warns Justin Bieber to clean up his act

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