Mischa Barton is now reportedly back to doing her bad habits, according to a report.

In an article on In Touch Weekly, it was mentioned that the former "The O.C" star has purportedly gone back to her party girl ways and was constantly around booze and drugs.

"We were at a party together about a month ago and Mischa was doing mushrooms, cocaine and smoking pot," an eyewitness revealed, as cited by the source.

"She's partying really hard," the eyewitness added. "She definitely could be in a bad spiral right now."

The news comes now after Mischa Barton made a red carpet appearance at a Hollywood event. The actress was seen at the "Paper Towns" premiere just last month. According to a report on Fashion & Style, she was "looking good."

Back in 2007 though, it was a different story. As told in Mail Online, she was arrested for driving under the influence and was taken to rehab years later. In 2013, she personally explained the ordeal she's gone through.

"It was a full-on breakdown," she told People back in 2011. "It was terrifying. Straight out of 'Girl, Interrupted.' Story of my life." 

"Almost overnight it was like this switch had been turned on," she explained then. "It was like this fascination switch on all of us, aimed especially at me. We thought, 'Work hard, play hard.' It was a train I could not get off of."

"When you're young, you can do it, but after a while, it's going to come crashing down on you," the actress added. 

"I think I was just really stressed out," Barton continued. "I don't think any of it would have happened if I hadn't been under such enormous pressure." 

Mischa Barton will now be seen again on TV, as mentioned by TV Line, as she stars in ABC's "Recovery Road" that will be seen later this year.