It seems like every day now, Amanda Bynes has a bone to pick with someone new.
Her latest feud is with former *NSYNC member Lance Bass.
Bass, who worked with Bynes on the 2005 film "Love Wrecked," said during a radio interview on Wednesday that he was "actually really scared" for the troubled starlet. "It's one of those situations where obviously there's some mental problems there and she's not able to see that. We all are," he said. "I hope someone is able to get her the help she needs."
Bynes, who has repeatedly insisted that she is not mentally ill, was not pleased.
"I ignored Lance Bass on twitter and now he is saying I have a mental illness," she tweeted. "Sorry you're an ugly ex boy bander w/ no talent or career."
"I haven't spoken to Lance Bass in 11 years," she continued. "To say I have mental illness out of nowhere makes me lash out! You're making me crazy!"
Bynes, the "Easy A" star, was arrested May 23 after she allegedly threw a bong from her apartment window. She has been charged with tampering with physical evidence, reckless endangerment and criminal possession of marijuana.
Since last summer, after Bynes was charged with a DUI and two counts of hit-and-run, Bynes has launched Twitter attacks on several of her critics. Click through to read a list of her targets.
Sports Illustrated model Chrissy Teigen.
Teigen tweeted Tuesday, May 28, "The fact that Amanda Bynes has any 'support' to retweet is really unsettling. Support people with mental illness, yes. But don't condone/enable scary and poor behavior."
Bynes then lashed out, calling Teigen an "old ugly model," though both Bynes and Teigen are 27.
"Ur not a pretty model compared to me," Bynes wrote in an extended tweet. "I signed to Ford models @ age 13. I don't look up to u beauty wise. I'm far prettier than u! I'm offended that you're saying I have a mental illness when I show no sign of it, but thankfully not one man that wants me wants you and you are an old ugly model compared to me!
"You look 45!" Bynes added. "You're not pretty so I'm not intimidated by you! I think you're jealous that you're just an ugly model whos career is uninspiring! I don't respect you! You're no beauty queen! I'm a beauty queen!"
The 27-year-old model left it there.
"Nope. Not going to indulge. Wish the best for her, truly," Teigen tweeted, asking her fans not to stoke the flames, either.
"Don't, guys," she wrote. "I don't need defending and please stop writing her. It's not funny, it's sad."
Just before launching into Teigen, Bynes blasted Courtney Love after the '90s rocker famous for her own substance and legal issues reached out on Monday by tweeting, "Amanda Bynes pull it together dude."
Bynes tweeted Tuesday, May 28, "Courtney Love is the ugliest woman I've ever seen. To be mentioned by her at all makes me and all my friends laugh!"
The 48-year-old Hole singer didn't take the bait, though, writing instead, "Will you people lay off on giving this girl such grief? Shes a beautiful talented young woman, we all go through our ups and downs. grow up!"
Actress Alyssa Milano responded to Love's tweet with her own offer to help Bynes, writing, "I would totally be there if you can reach her. Let me know if I can help in any way."
According to several media outlets, Bynes posted then quickly deleted a tweet to Rihanna on Sunday, May 26, saying, "@rihanna Chris brown beat you because you're not pretty enough."
On May 27, she denied she wrote it, adding, "I'm followed by so many people that someone is always mocking up fake tweets so I feel the need to address them!"
She then said, "Rihanna and I met and I'm sure we'll be in a music video together one day!"
After her arrest May 23, Bynes took to Twitter to accuse the New York Police Department of everything from illegal search to sexual assault.
"My lawyer and I are taking this mistake extremely seriously! You cannot illegally enter my apartment then take me to mental hospital without any grounds," she wrote as part of a series of tweets May 26. "I have never been so offended in my life. They found nothing criminal on me or around me, one cop then sexually assaulted me, so I'm suing for all of the above! I'll be happy when I get money compensation from the cop who assaulted me and NYPD for wrongfully arresting me and having me put into a mental hospital and jail overnight! I don't want to keep talking about it."
After conducting an investigation, the NYPD determined there was "no evidence to corroborate Ms. Bynes' allegations."
Earlier in May, Bynes started a war of words with actress and Playboy model Jenny McCarthy, after McCarthy retweeted erroneous reports that police were at Bynes' New York apartment.
"Police are at @AmandaBynes house. I hope they get her help. Enough of this circus. She needs help," McCarthy tweeted before later deleting it.
That's when Bynes lashed out, saying, "@JennyMcCarthy I need help? What are u talking about? Aren't u 50 years old? I'm 27, u look 80 compared to me! Why are you talking about me?"
She added, "@JennyMcCarthy you're ugly! Police weren't at my house old lady!"
McCarthy then offered an apology, saying: "Sorry girl. Looking out for ya."
Bynes accepted the olive branch and also apologized.
"Thanks! I'm sorry I offended you! You're beautiful! I was lying! I'll delete our tweets!" Bynes wrote.
In April, Bynes called Perez Hilton the "scum of the earth" and accused him of faking his concern for her well-being.
"I'm so sick of u saying ur sincerely worried about me," she wrote. "At least pick a photo from my Twitter if you won't stop talking about me."
In February, Bynes started her trend of calling people ugly with rap mogul Jay-Z. Bynes labeled Beyonce's husband, "ugly face," posting a picture of the rapper wearing glasses, before quickly deleting the post.
Jay-Z didn't bother to respond.