Child stars have the unique experience of growing up in the public eye, and that's usually not for best. While there are a handful of child stars that managed to grow up with grace and success, the majority of the most well-known cases have been had at least a phase of being a trainwreck.

Shia LaBeouf
Shia LaBeouf
This child star was introduced on the DIsney show "Even Stevens," and later became well known for his role in the "Transformers" movies. Most recently, though, his odd behavior includes going to a premiere with a bag on his head, disorderly conduct, and harassment; leading many to be turned off by the star's behavior.
Macaulay Culkin
Macaulay Culkin
Best known for his "Home Alone" movies, this cute kid, grew up to be a problematic adult, after being caught with marijuana, and prescriptions that were not in his name. He currently has a band that sings about pizza! But he's not doing much else in Hollywood.
Lindsay Lohan
Lindsay Lohan
The cute little girl in "The Parent Trap" remake, is now a grown up with very real substance abuse problems. She has been in rehab at least six times, has been accused of stealing from a jewelry store and famously made a number of bad choices. She's enlisted Oprah's help in getting her life back on track, so let's hope she can help.
Gary Coleman
Gary Coleman
Gary is another star from "Diff'rent Strokes," who is also believed to have suffered from "the curse." He was arrested several times for domestic abuse or violence, and ultimately died after suffering brain hemorrhaging at the age of 42.
Haley Joel Osment
Haley Joel Osment
Haley is best known for his role in "The Sixth Sense" as a little boy who saw dead people! He grew up making bad choices and being arrested for DUI, as well as other misdemeanors, and sentenced to 60 hours of community service.
Justin Bieber
Justin Bieber
Justin became famous when he did a YouTube video and his voice garnered much attention, and gain him instant fame. His bad decisions include women he slept with, taking drugs, fighting in public, DUIs, drag racing, and many other bad behaviors.
Britney Spears
Britney Spears
Britney Spears was a sweet, soft-spoken young lady who became a pop star at a young age. For a time, she made a string of bad decisions from getting married and divorced several times, shaving her head, and her other public antics, that made many fans shun her. She has now gotten herself back together and has come out with a new album recently.
Drew Barrymore
Drew Barrymore
Drew has been acting in Hollywood since she was a very little girl. She is known for being in the movies "E.T." and "Cat's Eyes." She began taking cocaine at the age of 13, entered rehab, tried to commit suicide at 14, and finally turned her life around. Now Drew Barrymore is a renown actress and an A-lister in Hollywood.
Jodie Sweetin
Jodie Sweetin
As Stephanie Tanner on "Full House," America fell in love with little Jodie Sweetin and her lovable catchphrase of "How rude!" Years later, Sweetin admitted to her addiction to crystal meth, which didn't even stop once she became a mother. Two kids and two marriages later, and she is finally clean and happy.
Corey Haim
Corey Haim
Corey is the epitome of bad choices made while growing up. As a child star, he began sleeping around with women and taking drugs at a young age. He admitted to taking 85 Valium pills in a day. Corey died of a drug overdose in March 2010; he was only 38 years old.
Taran Noah Smith
Taran Noah Smith
The youngest kid from the hit show "Home Improvement" turned out to be the problem child in real life. After the show ended when he was 16, he quit acting and married a woman who was double his age. They lasted 6 years until a divorce, and most recently Smith was busted with a DUI and possession of marijuana.
Amanda Bynes
Amanda Bynes
This Nickelodeon actress grew up to have several problems that have put her negatively in the limelight. She's had DUIs, fights with other celebrities, and accused her father of sexual abuse. She was recently found to have mental issues, and is now in treatment.
Corey Feldman
Corey Feldman
Known as the best friend, sidekick, and rival of Corey Haim; Corey Feldman was a cocaine, sex, and a heroin addict. He claims he's been sober for 10 years. Feldman had done a reality show with Corey Haim when Haim, unfortunately, passed away from a drug overdose.
Matthew Underwood
Matthew Underwood
Underwood played the wannabe bad boy on "Zoey 101," and although his co-star Jamie Lynn Spears was the one to get pregnant as a teenager, he was the one who landed in real hot water. The actor was busted giving marijuana to and sleeping with an underage girl.
Dana Plato
Dana Plato
Famous for being on the show "Diff'rent Strokes", Dana held up a store at gunpoint, forged Valium prescriptions, and ultimately died in 1999 of a drug overdose. Many believe that she was subjected to the "Diff'rent Strokes Curse;" as many of the cast have either died or had bad luck since the end of the show.
Jaimee Foxworth
Jaimee Foxworth
Known for her role in "Family Matters," she began to obsessively smoke marijuana and starred in a porn at the age of 19. She was featured on Dr. Drew's "Celebrity Rehab," but she admitted what sobered her up, was getting pregnant with her son.
Jeremy Jackson
Jeremy Jackson
Since playing young Hobie Buchannon on "Baywatch," Jackson has gone on to release a sex tape and admit his long-lasting drug problem on a season of "Celebrity Rehab." Jackson said that his drug addiction was even occurring while filming "Baywatch," and it was part of the reason he left the show.