Rihanna and Joan Rivers in Twitter row over Chris Brown

It's always odd when we see high profile celebrities publicly waging a war of words with each other, so imagine our surprise when we saw that Rihanna had become embroiled in a Twitter war with comedy legend Joan Rivers.

Joan Rivers and Rihanna becmae embroiled in a Twitter war. [Copyright Wenn]

Joan aired her disappointment in Rihanna after watching her very raw and open interview with Oprah Winfrey where she admitted to still loving her ex Chris Brown.

[Related Story: Rihanna tells Oprah: I do miss Chris Brown]

Known for her cutting remarks and controversial sense of humour, the 79-year old didn't hold back on exactly what she thought of the 'Where have you Been' singer.

The comic posted: "Rihanna confessed to Oprah Winfrey that she still loves Chris Brown. Idiot! Now it's MY turn to slap her."

Wow, that's a bit harsh don't you think?

Chris Brown and Rihanna in 2008 before the assault. [Copyright Wenn]

Reading the controversial comic's tweet, Rihanna was quick to respond with an equally catty remark.

She posted: "@Joan_Rivers wow u really do get slow when you're old huh?"

Later adding: "Slap on some diapers."

Meow!

Although we can completely appreciate Rihanna's anger toward Joan's comment.

Rihanna broke up with her ex Chris Brown in 2009 after he physically assaulted the singer before they were due to appear at the Grammy's.

The pair have since collaborated together on a remix of 'Birthday Cake' taken from Rihanna's album 'Talk that Talk'.