It's another day, which means another Twitter war for Amanda Bynes, this time with fashion model Chrissy Teigen. The troubled former child comedienne went on a Twitter rage after Chrissy wondered why people are supporting Amanda.

"The fact that Amanda Bynes has any 'support' to retweet is really unsettling," Chrissy wrote on Twitter.

"Support people with mental illness, yes. But don't condone/enable scary and poor behaviour."

In response, Amanda, who is 27 years old just like Chrissy, called the other girl "ugly" and "old."

"@chrissyteigen 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! 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!"

Instead of giving Amanda the fight that she craved for, Chrissy backed down, tweeting, "Nope. Not going to indulge. Wish the best for her, truly," adding to her followers: "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," she continued.

Amanda's reply isn't at all surprising as she calls everyone who doesn't agree with her "ugly." Her obsession with her physical appearance almost seems so comical, as if she's exaggerating it for attention or to gain notoriety.

This isn't the first Twitter fight for either of them.

Chrissy was slammed for calling "Teen Mom"-turned-porn star Farrah Abraham a whore after the latter released a sex tape and later claimed she thought she might be pregnant with porn star James Deen's baby. While Farrah wasn't exactly the most loved person on Twitterverse, many people said that it's wrong for Chrissy to "slut-shame" others.

As for Amanda, the list of people whom she fights on Twitter continues to grow.

Just this week, equally troubled rocker Courtney Love tweeted to Amanda to "pull it together dude." As expected, Amanda, targeted Courtney's looks in her reply.

"Courtney Love is the ugliest woman I've ever seen," she tweeted on Tuesday. "To be mentioned by her at all makes me and all my friends laugh!"