Justin Bieber, are you taking notes?
Mark Wahlberg iss the latest celeb to offer the young pop singer, who has been going off the rails a bit, some advice. The actor told the 19-year-old, "Don't be so naughty. Be a nice boy. Pull your trousers up. Make your mum proud. Stop smoking all that weed, you little bastard."
Yeah, he was kidding, but the 2 Guns star wasn't the first A-lister to try and shed some light on the young star.
Here are 9 other celebs that have given the Biebs some advice...
1. Miley Cyrus: After J.B. decided to pee in a mop bucket, his fellow pop singer friend (who knows a thing or two about growing up under the spotlight) decided to give Bieber some insight.
"I told Justin to take a bit of time out and people aren't so obsessed with you and nitpick," the 20-year-old singer told Britain's The Sun.
"He's still stupid though," the former Disney star added. "But everyone does dumb stuff when they are messed up, and he's done dumb stuff. If it was your friend pissing into a mop box then you would be laughing, but because it's Justin Bieber, then it's really bad."
2. New Kids on the Block: The popular boy band from the '80s wasn't too worried about Bieber, and noted that the media may just be exaggerating what's really going on.
"When I think of what I did when I was 19 or 20…I made some mistakes and I think we all have," Joey McIntyre said. "Unfortunately for some people, they have to live it all over the world or all over the internet."
"You kind of feel for the kid," McIntyre went on to say. "He's probably making some mistakes but hopefully he will get through it and realize there is more to life than playing arenas."
"For me, the most important thing was for him to know anytime he can just call and I'll come, whatever happens," Smith said. "At that age, that's what you need, to know you can do what you're gonna do, but you have somewhere you can go, where you can find safety."
4. Olivia Wilde: The beautiful actress gave the young star some straightforward advice that was disguised as a scolding. Hey, she doesn't mess around. And Wilde's main point of concern was not so much what Bieber was doing, but what he was wearing (or not wearing, in this instance).
"Bieber, put your f--king shirt on. (unless you lost all your shirts in a fire in which case my condolences and please purchase a new shirt)," she tweeted.
He has yet to take her advice. And something tells us Beliebers don't mind that.
5. The Jonas Brothers: Although Joe chalked up Bieber's antics by simply saying, "Boys will be boys," his younger bro, Nick, offered a more in-depth explanation on the matter while the trio was on Watch What Happens Live.
"Here's what I'll say is that everyone has to go through a period of growth," Nick said. "I think he's in that period now. I wish the best for him 'cause I do think he's a talented person. But he just has to get through a season of growth."
6. Channing Tatum: Even the Magic Mike star started to notice Bieber's shenanigans and spoke out about it.
"I worry about Bieber, man. That kid's wildly talented. I hope he doesn't fall down into the usual ways of young kids because it's so hard for someone to be responsible when they're not asked to be," he told Vanity Fair.
"We're not asked to do things ourselves. You have someone there with a coffee. 'You want food? I'll get you food.' I put my bag in the trunk yesterday—I can't drive here—so my driver, great guy, Terry, amazing, I call him T-Bone, I drop my bag in and left the trunk open. And I get around to my door, and I'm like, ‘What the f--k am I doing? That's not my behavior.'"
7. Christina Aguilera: Growing up on The Mickey Mouse Club, Xtina spent most of her youth in the spotlight, so she could relate to Bieber, and suggested that maybe he take a step back from it all to gain a fresh perspective.
"I would tell [Bieber], don't let anything morph you or push you around or have you be something you're not," Aguilera told Hollyscoop. "I've always been really honest and true to my own roots and been really grounded, not letting myself stray too much."
She added, "You live life and it's hard to grow up in front of a camera. You learn as you get older to take moments for yourself, step away from the camera, re-inspire yourself as an artist, rejuvenate and refresh."
Bon Jovi commented on the young star's unprofessional behavior (as he called it) during an interview with the London Evening Standard.
"Every generation has guys that do that, none of that is new," the 51-year-old said, and later added, "Do it once, you can be forgiven. Do it enough times and shame on you. They won't have you back. Then it just becomes a cliché. It's really not cool—you're an a--hole. Go to f--kin' work!"
9. The Wanted: The English-Irish boy band didn't tell Bieber to shape-up and clean his act. Instead they just gave him (very interesting) tips on what to do and what not to do while visiting London.
"Watch out for loose women," Max George told E! News at the Stars & Strikes Celebrity Bowling & Poker Tournament. "There's a lot of them in England."
Meanwhile, Jay McGuiness had some suggestions on dealing with the U.K. paparazzi. "Keep your head down, keep walking," he said.
"Security," Siva Kaneswaran added. "Bring security."