Chris Brown has deleted his Twitter account following a foul mouthed attack on a comedy writer who challenged him over his 2009 assault of the singer Rihanna.Before the deletion the R & B singer appeared to confirm reports that he is once more dating the Barbadian singer, tweeting: ‘Just ask Rihanna if she mad??????’

Jenny Johnson, who has nearly 300,000 Twitter followers, had challenged the singer by telling him: ‘Being a worthless piece of s*** can really age a person.’

Her comment came in response to his tweet: ‘I look old as f***! I’m only 23…’

In response to Johnson’s tweet Brown let rip in a foul mouthed attack: ‘Take them teeth out when u Sucking my d*** HOE.’

An unrepentant Johnston corrected Brown’s spelling, saying: ‘It’s “HO” not “HOE” you ignorant f***.’

Brown then lost his temper and amongst his abusive tweets told her: ‘mom says hello… She told me not to s**** in ur mouth, wanted me to s*** right on the retina.’

PLUS: Now Rihanna tweets topless photo of herself… after tweeting Chris Brown’s  (PHOTOS)
And: ‘I should fart while ur giving me top.’

Jenny, who lives with her husband in Texas, replied: ‘Your mom must be so proud of you.’

And she then ended her side of the conversation, explaining: ‘Okay. I’m done. All I got from that exchange with Chris Brown is that he wants to s*** and fart on me.’

And she added: ‘I have zero respect for a person who seems unapologetic for the terrible crime he committed and shows no signs of changing.’

In 2009, Brown hit, choked and bit Rihanna during an argument in Los Angeles.

He later pleaded guilty to assault.  Since then, Brown has worked to repair his image, undergoing violence counseling and putting out a new album.

He has a duet with Rihanna on her recently released record, Unapologetic.

Rihanna has denied reports that they are dating, but on Saturday night tweeted a picture of a shirtless Brown sprawled on her hotel bed.

She spent Thanksgiving at Brown’s gig in Berlin, downing shots with him before heading back to his hotel.