Amanda Bynes has lashed out at Rihanna via Twitter Sunday afternoon, blaming the singer for the reason she was assaulted by ex-boyfriend Chris Brown.

Bynes started the argument by writing to Rihanna racist and offensive tweets. The troubled star wrote, "@rihanna you look so ugly tryin to be white," but quickly deleted it according to Dailymail.

Bynes then wrote on her account "@rihanna Chris Brown beat you because you're not pretty enough." The 27-year-old singer quickly responded on her Twitter, "Ya see what happens when they cancel Intervention?" Bynes wrote back to Rihanna, "Unlike ur fugly faced self I don't do drugs! U need the intervention dog! I met ur ugly face in person! U aren't pretty u know it!" Bynes has deleted all tweets towards Rihanna from her Twitter account.

Bynes was arrested this Thursday for marijuana possession and charged with reckless endangerment, unlawful possession of marijuana and attempted tampering with evidence. She was sent to a hospital for a psychiatric evaluation and is set to appear in court July 9th according to TMZ.