New York: R&B star Rihanna has posted topless picture of herself on a social networking site after celebrating Halloween bash at Greystone Manor.

The 24-year-old `Umbrella` hit maker`s picture was captured "The morning after! Hello November," showing off a bit of her new Isis chest tattoo, which she had etched in memory of her late grandmother, reported the Huffington Post.

Rihanna`s ex-flame Chris Brown also attended the event dressed like a terrorist.

The "We Found Love" singer wore a `weed princess` costume and she was not the only celebrity to have the green idea. Pop sensation Lady Gaga also wore a Halloween costume dressed up as a cannabis plant.

Lindsay Lohan and Paris Hilton also attended the party.


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