Mark Wahlberg explained to The Sun that if Bieber doesn't clean up his act, he's at risk of ruining his career.
"Justin, are you listening," said Wahlberg. "Be a nice boy, pull your trousers up, make your mom proud and stop smoking weed you little..." -- we'll stop there.
The former Marky Mark and the Funky Bunch frontman also led a troubled youth.
"He's a teenager living in a different day and age," said the "Two Guns" actor. "I was in prison before I got a record out and I don't think he's been to prison."
Wahlberg and The Biebs were in talks about collaborating on a basketball-themed movie but it's since been put on hold.