Although actress Amanda Bynes looked happy and healthy as she celebrated her 28th birthday in Mexico last week, it wasn't that long ago when she became notorious for displaying bizarre and erratic behavior.

In 2013, she posted a number of disturbing tweets, allegedly threw a marijuana bong out of a high-rise Manhattan apartment and walked around with a messy blonde wig. In July, she was finally committed to a psychiatric hospital after she set fire to a stranger's driveway, around the corner from her parents' home in California, reports the Huffington Post. As a result, her parents were granted full conservatorship over her fortune and she was rumored to have been diagnosed with schizophrenia.

However, now that she has shown tremendous progress in her mental health since being released from a mental rehabilitation facility in Malibu, the former child star is speaking out to dispel rumors about her mental condition.

According to her attorney, Tamar Arminak, the "Hairspray" actress "does not have schizophrenia, nor has she ever been diagnosed with it," reports People magazine.

"There has been much speculation about Amanda's medical condition," Arminak told People. "She has remained silent because she believed it was best to keep her mental health diagnosis private."

He added that she's currently on "zero medication," and is "devoted to living her life as healthy as possible." Plus, Bynes' lawyer maintains that the actress "never had a history of abusing alcohol or hard drugs, and she's proud to say she's been marijuana-free for the past nine months."

He went on to say that Bynes, who is currently enrolled at the Fashion Institute of Design & Merchandising, is "doing extremely well," while a family source told the magazine she "continues to undergo outpatient therapy several times a week," and explained that she is still working through the causes of her past behavior.