Amanda Bynes and Rihanna Feud

Amanda Bynes just inexplicably railed on Rihanna on Twitter, saying Chris Brown beat her because she's ugly ... but RiRi got the last word and it was AWESOME.

Bynes tweeted -- and quickly deleted -- "@rihanna Chris Brown beat you because you're not pretty enough."

She followed that up with another insult -- about wanting to name her dog Rihanna. It's unclear what set her off.

RiRi clearly got wind of the deleted tweets, because she just posted the BEST COMEBACK EVER:


Ya see what happens when they cancel Intervention?

Amanda has already responded (and already deleted):

"@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!"

I'm very upset by Amanda Bynes not because of this but because of how she's turned out now I used to Love Amanda Bynes Back in the day from her movies and TV Shows Shes Turning out like Lindsay Lohan and its a damn shame.

Rihanna is a fucking beast on twitter! She stay putting hoes in their place.

I hope Amanda is heading in the Britney direction and not the Mariah and Lindsey direction.

Brit eventually got her life on track, Lindsey is still a mess and Mariah is just plain cray cray.