Rawr!twitpic.com/cngt8p— Amanda Bynes (@AmandaBynes) May 2, 2013
Long hair don't caretwitpic.com/cnhlbk— Amanda Bynes (@AmandaBynes) May 2, 2013
It all began when McCarthy tweeted (and later deleted) "Police are at @AmandaBynes house. I hope they get her help. Enough of this circus. She needs help."
Bynes responded to the tweet by politely writing, "@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?"
Later adding, "@JennyMcCarthy You're ugly! Police weren't at my house old lady! Shut the f--k up!"
But the blondes later made up when McCarthy posted an apology, prompting Bynes to apologize herself and take back everything she had said before.
"Sorry girl. Looking out for ya," McCarthy wrote.
"Thanks! I'm sorry I offended you!" Bynes reponded. "You're beautiful! I was lying! I'll delete our tweets!"
@jennymccarthy thanks! I'm sorry I offended you! You're beautiful! I was lying! I'll delete our tweets!— Amanda Bynes (@AmandaBynes) May 2, 2013
McCarthy isn't the first person to go up against Bynes in a tweet fight.
Ever since the "She's the Man" actress retired from acting and moved to New York City she has engaged in several arguments and Twitter rants regarding her odd behavior.
The 27-year-old actress has even threatened to sue blogger Perez Hilton and Us Weekly for writing what she calls fake stories about her.
According to Forbes, it's not too late for Bynes to make a comeback, but to do so she would need to begin by getting a guardianship -- which is exactly what Britney Spears did after shaving her head and smashing a paparazzi's car with an umbrella back in 2007.