The 30-year-old actress claims someone has been impersonating her on Twitter.
Amanda Bynes returned to Twitter on Tuesday night to set the record straight.
After nearly six months without any presence on social media, the 30-year-old actress tweeted that someone was impersonating her online. "I am not @persianla27. I am not getting married and I am not pregnant," she posted on Tuesday night. "I don't understand why twitter won't take @persianla27 down."
WATCH: Amanda Bynes Shows Off Her New Haircut
"I have asked repeatedly," she continued in another tweet. "This person continues to impersonate and harass me and twitter needs to take the account down."
Bynes has not posted on Twitter since August 24, when she updated her followers on where she's been after another six-month social media hiatus. "Hi everybody! I haven't tweeted in a long time and I want to say hi! I've been really busy at FIDM, and I just finished my midterms," she shared. "I am really loving school and I feel that I am learning a lot. I enjoy all of my classes and my teachers are excellent."
Like her recent tweets, the What I Like About You star also alerted fans that she would only be posting from her verified account, and that "no other Twitter accounts or websites" were hers.
WATCH: Amanda Bynes Makes Rare Appearance in Revealing Dress at Hollywood Hotspot
"I only have this one," she wrote. "I don't know why some people use my photos or try to pose as me, but they do. Please don't be confused or believe any of them."
"This is me! The verified, real, authentic and actual Amanda Bynes," she continued. "Accept no substitutes!"
MORE: Amanda Bynes -- I Was Diagnosed Bipolar and Manic Depressive
A few years ago, the actress started exhibiting bizarre behavior that included her allegedly throwing a bong out of a New York City apartment window in 2013 and a DUI arrest the following year. In October 2014, the former Nickelodeon child star was placed in a Pasadena treatment center where she was admitted involuntarily.
A week after being released, Bynes said via Twitter that she had been diagnosed as bi-polar and manic depressive. "I'm on medication and I'm seeing my psychologist and psychiatrist weekly so I'm fine," she explained.
PHOTOS: Amanda Bynes -- From Cute Child Star to a Young Woman
ET has seen Bynes grow up and was with her on the set of The Amanda Show in 2001 when she was just 13 years old. Check out the flashback interview: