Amanda Bynes just made her biggest mistake to date: she dared to cross Rihanna.
In a Tweet that has since been deleted, the effed up actress randomly SLAMMED Rihanna, writing of the singer and her infamous run-in with Chris Brown's fists:
"@rihanna Chris Brown beat you because you're not pretty enough."
Bynes added that "no one wants to be your lover so you call everyone and their mother that I almost named my dog Rihanna."
Rihanna replied to Amanda's unexplained diss with one simple, awesome sentence:
"Ya see what happens when they cancel Intervention?"
And soon afterward Bynes was at it again, sending another Tweet that she quickly erased, but not before it etched its way on to the Internet for all to see:
"@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!"
RiRi is yet to write back to this profound insult, but there is a silver lining to this unexpected feud: it can distract Rihanna from Brown moving back in with Karrueche Tran.