In a series of since-deleted tweets, the troubled 27-year-old actress railed against Rihanna.
"@rihanna you look so ugly tryin to be white," Bynes wrote.
"Chris Brown beat you because you're not pretty enough," Bynes also said, in reference to Brown's 2009 assault of Rihanna, his then girlfriend.
After an eventful week involving her arrest and a psychiatric evaluation, Bynes once again took to Twitter to share her side of the story. In an extended Twitter post, the former "Hairspray" star claimed that her tweets insulting Rihanna were "mocked up."
"I saw a bunch of mocked up tweets about me bashing Rihanna in my mentions," Bynes said. "I'm followed by so many people that someone is always mocking up fake tweets so I feel the need to address them!"
Bynes, who also announced Monday that she wanted to re-launch her career as a singer and rapper, seemed to think there would be no bad blood between her and the pop star.
"Rihanna and I met and I'm sure we'll be in a music video together one day!"
Bynes went on to refute allegations that she has a drug problem. Read the full post below:
@matthewnewcomen: @AmandaBynes You made the ny post! Bashing riri? http://t.co/PRO5kz7bD7 I saw a bunch of mocked up tweets about me bashing Rihanna in my mentions. I'm followed by so many people that someone is always mocking up fake tweets so I feel the need to address them! Rihanna and I met and I'm sure we'll be in a music video together one day! That's one of the mocked up images, they took photos of me from outside and morphed them onto someone else's body. I am allergic to marijuana and alcohol but I smoke tobacco. Why does Rihanna smoke weed and not get in trouble for it but I smoke tobacco and people think I'm on drugs? I refuse to be treated like someone I'm not, which is why I fought for myself and am suing everyone involved. I don't need to go to rehab. There is never a drug or alcohol in my system! I'm sick of all the lies! What would you do if someone accused you of things you didn't do and yet you still had to be in jail at all over it! I'm so offended but I am so educated that I know cops cannot illegally enter my apartment, sexually harass me, arrest me, take me to a MENTAL HOSPITAL, then lock me up for a crime I didn't commit. I'm suing them all for this upsetting nightmare. My lawyer knows I'm a model citizen who doesn't partake in drugs. He's going to court this week to set the record straight again on my behalf. Thankfully I'm an educated multi-millionaire who knows better than to speak to perverted unjust cops without my lawyer.