AMANDA BYNES DISS RIHANNA i almost name my new dog RIHANNA cos she's a DOG

5/26/2013 10:56 BY HAMEEN SLEEK

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's got back to her with a smack down tweet


Don't mess with RiRi.