First Posted: May 29, 2013 02:17 PM EDT

Amanda Bynes posted a picture wearing a bra on Twitter on April 30, 2013. (Photo : Twitter)

In Amanda Bynes' latest cry for help and attention, the troubled actress attacked model Chrissy Teigen after she tweeted her concerns that Bynes has a mental illness.

With Bynes' arrest record and bizarre antics, there's no wonder why Teigen—or anyone else who's been following her downward spiral—would think that that she suffers from mental illness. However, the former child star didn't take it lightly when Teigen suggested that she's mentally unstable.

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"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," wrote the 27-year-old Sports Illustrated model on Twitter.

In response, the former Nickelodean actress lashed out on Teigen, and insulted with her usual "you're ugly" line and by calling her "old," although the two women are the exact same age.

"Ur not a pretty model compared to me. 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!," said Bynes in an extended tweet. She continued: "You look 45! 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!"

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Teigen chose not to retaliate to Bynes' rant and instead tweeted, "Nope. Not going to indulge. Wish the best for her, truly."

Teigen, who is engaged to Grammy winner John Legend, went on to ask her fans not to attack Bynes, tweeting, "Don't, guys. Just don't...I never ask anything of you guys but please. I don't need defending and please stop writing her. It's not funny, it's sad."

Other celebrities who Bynes has called "ugly" include Rihanna, Jenny McCarthy and Courntey Love.

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