Amanda Bynes went on a vicious, unexplainable Twitter tirade against Rihanna on Sunday.
"Chris Brown beat you because you're not pretty enough," she tweeted. "No one wants to be your lover so you call everyone and their mother."
Rihanna shot back, "Ya see what happens when they cancel Intervention?"
Bynes responded again, "unlike your fugly faced self I don't do drugs! U need the intervention dog! I met your ugly face in person. U aren't pretty u know know!"
She deleted that tweet soon after too.
While it's unclear why Bynes lashed out against the singer, we can't say we agree with the assessment. Rihanna has been posting tons of Instagram pics-- like this one of her dressed up as Marilyn Monroe-- and we have to say, girl looks FIERCE.
Don't worry Rihanna, tough times don't last but tough people do.