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FILE - In this Sunday, Nov. 18, 2012 file photo, Chris Brown arrives at the 40th Anniversary American Music Awards in Los Angeles. According to reports, Monday, Nov. 26, 2012, Brown has taken down his Twitter account after a vulgar, online feud with comedian Jenny Johnson. Johnson says she is now receiving death threats on Twitter from Brown s supporters. Brown had 11.6 million followers on Twitter. (Photo by John Shearer/Invision/AP, File)
R&B singer Chris Brown has taken down his Twitter account after a vulgar online exchange with comedian Jenny Johnson.

Johnson says she's now receiving death threats on Twitter from Brown's supporters.

The fight started when 23-year-old Brown posted a picture of himself, saying he looked old. Johnson replied: "I know! Being a worthless piece of (expletive) can really age a person."

Brown fired back a series of crude sexual jokes. Johnson posted a link to a news story about Brown's 2009 assault on singer Rihanna.

Before deleting his account, Brown wrote: "Just ask Rihanna if she mad??????" The on-again-off-again couple have been seen together recently.

A representative for Brown's record label didn't immediately respond Monday to an email seeking comment.

Brown had 11.6 million followers on Twitter.

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Online:

http://www.twitter.com/JennyJohnsonHi5