Jon Hamm has branded Justin Bieber a "sh**head."
The 'Mad Men' star thinks the 20-year-old singer - who is facing charges for Driving Under the Influence (DUI), resisting arrest and possessing an invalid driver's licence in Miami in January - needs a reality check and should learn "basic life skills" so fame doesn't ruin his life.
The 43-year-old actor told the May issue of Men's Fitness magazine: "Look at Bieber or whoever. You're like, 'What the f**k, man? What are you doing? Why?' There's no one telling those people no, and it's a shame."
The Golden Globe-winning actor said that Justin needs "a mom or a dad or a really good friend who can say, 'Hey, sh**head!' "
He added: "You see people in the world and you're like, 'Do you know how a washing machine works? Do you know how to wash a dish?' Life skills are something we're missing... just s**t you needed to learn in life. There used to be a class that kids had to take in high school called home economics, which was cooking and sewing and just s**t you needed to learn in life."
Jon previously lashed out at reality stars, including Kim Kardashian and Paris Hilton, for being famous for "being a f**king idiot" in 2012.
He said: "Whether it's Paris Hilton or Kim Kardashian or whoever, stupidity is certainly celebrated. Being a f**king idiot is a valuable commodity in this culture because you're rewarded significantly. It's celebrated. It doesn't make sense to me."

Cuba Gooding Jr. and Sara Kapfer have reportedly split up.
The Oscar-winning actor's wife filed court documents seeking a legal separation from the 'Jerry Maguire' star on Tuesday (22.04.14) after 20 years of marriage.
According to gossip website TMZ.com, Sara wants joint legal and physical custody of their children, Spencer, Mason and Piper, and child support will be determined at a later date.
The couple tied the knot in 1994 after meeting in high school.
Just last year, the 'The Butler' star, 46, gushed about being married to Sara on 'The View,' but he admitted he was struggling to find time to be with his family while performing in 'The Trip to Bountiful' on Broadway.
He said: "When you do films, you're away from the family, but I can still fly them in or fly home to see them, so... my wife and I... have this rule - never go more than three or four weeks without seeing each other.
"But I knew this commitment meant that I would be in New York City for a long time; I'm here possibly through September, so it's a bit of a pull on that to keep the household together. But she allowed me to be indulgent for obvious reasons... This is a once in a lifetime opportunity."
He added: "I got a wonderful lady that knows how to run the household even when I'm not there. (And) we're just blessed with wonderful kids."

Justin Bieber wants to delay his upcoming trial in Miami, Florida.
The 'Confident' hitmaker, is due to appear in court on May 5 to face charges for Driving Under the Influence (DUI), resisting arrest and possessing an invalid driver's licence in January, but filed court documents on Monday (21.04.14) seeking to postpone the case.
The Canadian singer's lawyers will meet with prosecutors and a judge in Miami for a prescheduled meeting later today (23.04.14), during which the judge will decide whether or not to change the 20-year-old star's trial date.
Justin, who recently reunited with his on-again, off-again girlfriend Selena Gomez, 21, is currently on holiday with his mother, Pattie Mallette, in Japan.
A source told E! News: "He took his mom and a friend to Japan."
The 'Heartbreaker' singer is trying "to be a better person" and wants to repair his reputation after displaying bad behaviour in recent months.
Another insider recently said: "He's making more of an effort to hang out with people who are positive influences in his life.
"He has started listening to the people around him and he knows it is not too late to change things. He's being more selective with his friends. He wants people around him that will help him and guide him and keep him on the right path."

Josh Hartnett has hinted he regrets dating Scarlett Johansson.
The 35-year-old actor - who is currently in a relationship with British actress Tamsin Egerton - claims that romancing some of his former co-stars has had a negative impact on his career and made him "a lot of enemies" in Hollywood.
Asked about finding love on set, the 'Penny Dreadful' star told Elle magazine: "I don't recommend it to young actors. You can make a lot of enemies in the business that way. But when you work with somebody every day, it's like trial dating. You develop a fantasy about them. It doesn't always work out, does it?"
Josh dated Scarlett for almost two years until 2007 after meeting her on the set of 'Black Dahlia,' and also dated Julia Stiles in 1999 after meeting her on the set of 'O.'
He split from 'Les Miserables' actress Amanda Seyfried, 27, in June 2012 after six months of dating, and also briefly romanced Kirsten Dunst, Sienna Miller, Rihanna and Penelope Cruz.
The actor also suggested jealousy has been a problem for some of his famous ex-girlfriends.
Discussing the secret to a happy relationship in Hollywood, he said: "Let them be on set whenever they want, with whichever co-star you're working with. Never say the scene is too sensitive. They get very suspicious."
But the actor - who began dating Tamsin "long after" he met her on the set of 'Singularity' in 2012 - admitted that none of his friends are willing to listen to him complain about dating some of the world's most beautiful women.
He said: "They want to hear all about what you're doing, but they don't want to hear any complaints. Back when I dated a few very beautiful, very famous girls, I said something once - it wasn't really a complaint - and my buddy said, 'Oh my God, my diamond shoes are too tight.' He coined the phrase."

Ryan Lewis has revealed his mother is HIV-positive.
The 'Same Love' hitmaker, who is one half of the Grammy-winning hip-hop duo Macklemore & Ryan Lewis, opened up for the first time about Julie Lewis contracting the virus, after being given contaminated blood during an emergency transfusion in 1984, as he launched his new non-profit the 30/30 Project to provide access to affordable healthcare across the globe.
The 26-year-old star wrote on the organisation's fundraising page on Indiegogo.com: "If I could just take a few moments of your time, I'd love to tell you about the strongest woman that I know, my mom, Julie Lewis.
"In 1984, my mom gave birth to my older sister, Teresa. Due to a complicated delivery, she needed a blood transfusion and at that moment, my mom had HIV-positive blood put into her body. When she was finally diagnosed, she was given only a few years to live."
He added: "To honour the 30 years my mom has been a survivor, our family is raising funds to build health centres worldwide that will stand strong for at least 30 years.
"We're calling it the 30/30 Project."
The organisation's first mission is to raise $100,000 to build a health centre in the Neno District of Malawi, Africa, where one in 10 people are HIV-positive.

Adam Levine and Blake Shelton are thrilled Gwen Stefani is in talks to join 'The Voice' USA.
The 44-year-old singer is in final stage negotiations to replace Christina Aguilera - who wants to focus on her pregnancy after recently announcing she is expecting her second child - on the seventh season of the show, which will begin filming in June, and the Maroon 5 frontman hopes the No Doubt singer closes the deal soon.
He told E! News: "If there were a person named Gwen Stefani, who was great... if there was a person named Gwen Stefani that was going to be on the show, that happened to also be the singer in No Doubt, a fashion icon, and many other wonderful things, I think if that were to happen that would be great. But I can't say whether or not that is true."
Country singer Blake added: "I think she would probably be a great addition to this show."
The show's host Carson Daly also hopes the 44-year-old beauty, who gave birth to her third son in February, will join the series.
He said: "She's awesome. I hope it's true. Nothing's confirmed, but if that's the case, should there be fire behind the smoke, we should be so lucky! She's one of my favourite people and one of my favourite artists, but more importantly I think she would be a great fit for our family."
It was recently confirmed that 'Happy' hitmaker Pharrell Williams is joining the panel in replace of CeeLo Green.

Katie Holmes admits she can be tough when she needs to be.
The 35-year-old actress, who divorced Tom Cruise in June 2012 and secured sole custody of their eight-year-old daughter, Suri Cruise, says that people shouldn't "underestimate" her.
Asked if she is anything like the bad girl she plays in her new movie, 'Miss Meadows,' the brunette beauty told E! News: "I don't have a drawer full of weapons in my house if that's what you're asking, but I can be tough when I need to be."
She added: "I'm an Ohio girl. Don't underestimate us."
The former 'Dawson's Creek' star set up home in New York City with Suri following her sudden split from Tom and feels very at home there.
She said: "I've always loved New York and I've spent so much time here so many times in my adult life. I have spent more and more time here recently obviously, and yeah I do feel like a New Yorker. I love New York and New Yorkers have really been so kind to myself and my little one, and I just appreciate it. There are so many moments that you have in this city that you connect with all different walks of life and it really means everything."
Meanwhile, Katie is looking forward to celebrating Mother's Day with her daughter in the US next month.
She said: "I'm one of four girls, I've a bunch of aunts and cousins, so Mother's Day is a really big deal. My sisters and I are starting to figure out a plan for ourselves. It's fun, I always love Mother's Day."

Katherine Jackson "isn't worried" about Debbie Rowe's bid to gain custody of Michael Jackson's three children.
The former nurse - who was married to the late 'Thriller' star for just under three years until October 1999 - reportedly wants to secure guardianship of their son, Prince, 17, and daughter, Paris, 15, and his son Blanket, 12, who was born via surrogate, because she thinks their grandmother Katherine, who is the children's legal guardian, is too old to care for them properly.
But a source told PEOPLE.com: "Katherine isn't worried about it. It will never happen. She's not heard a word about this from Debbie Rowe officially or unofficially and she hasn't been contacted by her lawyers."
Katherine, 83, shares custody of the children with their cousin T.J. Jackson, and lives with them in Los Angeles.
Michael's brothers, Jermaine, Tito, Jackie and Marlon Jackson, recently accused Debbie of abandoning her children for money following her split from Michael.
They said: "We are quite taken back that Ms. Rowe has decided now to enter their lives, after she abandoned her children many years ago for money."
Debbie has been slowly rebuilding a relationship with her daughter, Paris, since the 'Billie Jean' hitmaker's death in 2009.

Drew Barrymore has given birth to her second child.
The 39-year-old actress, who already has a 19-month-old daughter Olive, welcomed another baby girl, called Frankie Barrymore Kopelman, into the world with her husband, Will Kopelman, 36, in Los Angeles on Tuesday (22.04.14).
In a statement to PEOPLE.com, the couple said: "Happy to announce that today we are the proud parents of our second daughter, Frankie Barrymore Kopelman. Olive has a new little sister, and everyone is healthy and happy!"
Drew - who confirmed she was expecting another daughter in December - celebrated the impending arrival of her baby at a star-studded baby shower with friends, including Gwyneth Paltrow, Cameron Diaz and Reese Witherspoon less than two weeks ago.
The 'Charlie's Angels' star recently revealed her second pregnancy has been much smoother.
She explained: "It is easier because when you're first pregnant you're just terrified of every single thing that's happening, so this time you're busy, you're focusing on the kid, the time goes a little bit faster ... not a lot faster, but it helps."

Uma Thurman and Arpad Busson have split up again.
The 'Nymphomaniac' star got engaged to French billionaire 'Arki,' with whom she has 21-month-old daughter Luna, for the second time in 2011 after calling off their first engagement in 2009, but they recently ended their romance for good.
A source told UsMagazine.com: "It's true."
The 43-year-old actress first sparked rumours she was single again after attending the Room to Grow Spring Gala in New York City alone and without her engagement ring.
An insider told the UK's Mail on Sunday newspaper: "Uma and Arki were due to attend a gala together on April 8, but Uma showed up without her engagement ring or her fiance. Arki was scheduled to attend and it seemed clear there was only one reason why he didn't show - because he and Uma are no longer an item."
The blonde beauty, who also has a daughter, Mia, 15, and son, Levon, 12, with her ex-husband, Ethan Hawke, recently admitted that she is happier than she has been in years.
She said: "I'm happier now than I've been in many, many years. I'm trying to live as peaceful a personal life as possible. I guess I'm less jaded now than I've ever been, definitely less than when I was younger."
Arpad also has two sons, Flynn, 16, and Cy, 11, with supermodel Elle Macpherson.

Cameron Diaz doesn't feel "childless."
The 41-year-old actress hasn't completely ruled out becoming a mother in the future, but doesn't feel it is important because she spends a lot of time with her nieces, nephews and friends' children.
The 'The Other Woman' star told the UK's The Telegraph newspaper: "I've never said never to anything in life. If I wanted kids, at any point in life, I would have them. But I'm certain that if at any point I wanted a child, that child would find its way into my life, whether through adoption, or through being in a relationship with somebody who has a child."
But the blonde beauty, who previously dated Justin Timberlake and Jared Leto, doesn't feel like she is missing out motherhood.
She said: "I can't see the future, but one thing I do know is that I'm not childless. I have a ton of children in my life. I can have a kid any second, if I want. All my friends would be like, 'Sure, come and get them.' "
She added: "I also, by the way, have a lot of girl friends who don't have children. It's not like I'm the spinster who didn't have a child. I just didn't do that in life, and I'm OK with that. I know the choices I made. I know why I made them. I'm very much a person who lives in the moment. When you come from where I do, there are so many ways my life could have gone."

Kanye West asked James Franco and Seth Rogen to perform at his upcoming wedding to Kim Kardashian.
The 36-year-old rapper was so impressed by the duo's spoof of his 'Bound 2' music video in November, which saw the comedians imitating Kanye and Kim by smooching shirtless on the back of a motorbike, that he reached out and asked them to re-enact it live before the couple's nuptials in Paris on May 24.
Asked if he received any feedback from them about the video, James told 'The View' on Tuesday (22.04.14): "We did get feedback. Kim loved the video and we didn't hear back from Kanye - we kind of felt like he's not bashing us but he probably hates it and he's just not going to say anything.
"But then two weeks ago we got a call from Kanye. Seth and I were on the phone and we thought he was going to let us have it, but he loved it and not only that, I think I can say it now because I'm pretty sure it's not going to happen, he wanted us to perform it live the night before his wedding at Versailles."
While they were tempted by the offer, James, 36, thinks they would regret the experience.
He said: "I think it would have been awesome for about 10 seconds and then there would be Seth with his shirt off in front by all the Kardashians."
The Palace of Versailles in France previously denied that the 'Keeping Up with the Kardashians' beauty and Kanye would be getting married there.
The couple recently fuelled speculation they will marry at the Chateau Louis XIV in Louveciennes, 14 miles away from Paris, as Kim was spotted visiting the property earlier this month.