TWITTER BEEF: Rihanna Responds To Joan Rivers Diss Over Chris Brown!

(Rihanna spotted in L.A on a shopping spree yesterday)

Rihanna recently poured out a lot of emotion on her recent interview with Oprah for "Oprah's Next Chapter"
The candid interview saw the pop star revealing a lot about the past couple of years of her life and also admitting to still loving Chris Brown.

Unfortunately some didn't take her admission quite lightly. Joan Rivers of  "E" expressed her opinion's via twitter about Rihanna's admission. Joan Went on to tweet :

Rihanna responded by saying this, "@Joan_Rivers wow u really do get slow when you’re old huh?" however the tweet has since been deleted.

She also went on to tweet:

Clearly, Rihanna is never one to hold her tongue but Joan certainly doesn't hold her own either.

Talk about some twitter beef. Does Joan have a valid point though? What do you guys think?