OMG!!!  HOLLYWOOD'S most recent train wreck .... AKA 'Amanda Bynes' ......  is messing with Rihanna via twitter???? WOW girl!!  That's pretty ballsy!!!  You know Rihanna don't play!!!  We may just after all just see Miss Rihanna Breakin' Dishes FOR REAL!!!  
 
 
Amanda Bynes to Rihanna
'Chris Brown Beat You
Because You're Not Pretty Enough'
0526_amanda_bynes_tweet
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:


Don't mess with RiRi.

update_bar
UPDATE 11:03 AM PT -- Amanda has already responded: