While it was reported that Amanda Bynes' bizarre antics in 2013 were linked to mental illness, her mother, Lynn Bynes, says that her daughter has never been diagnosed with a mental disorder.

Rumors began to swirl last year that the 28-year-old actress suffered from some type of mental illness after she posted a number of disturbing tweets, allegedly threw a bong out of a high-rise Manhattan apartment and walked around with a messy blonde wig.

In July, she was 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 there were reports that she was diagnosed with schizophrenia.

However, Lynn has set the record straight, telling E! News, that "Amanda has no mental illness whatsoever. She has never been diagnosed as schizophrenic or bipolar."

According to Lynn, Amanda's history of erratic behavior, which also includes a 2012 DUI, was caused by marijuana. She added that her daughter "is very sorry for all the hurtful tweets, statements and actions that occurred while she was under the influence of marijuana."

In addition, Amanda's attorney, Tamar Arminak, also released a public statement saying that the "Hairspray" star "does not have schizophrenia, nor has she ever been diagnosed with it," according to 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.