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Rihanna has fired back at critics who have taken aim at her latest drug-related tweet, insisting she doesn't care what they think.

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The R&B stunner was savaged online after posting a photo of marijuana on Twitter late Wednesday night and writing, "This nug look like a skull or am I just [hallucinating]....?"

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Followers attacked her for setting a bad example for young fans, with one detractor stating, "Wow wat [what] a good influence you are on young girls ... not," while another added, "I dont understand what she [is] tryin to prove through pics of drug everyday."

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The tweets prompted the defiant "We Found Love" singer to post a photo of herself alongside a caption, which reads, "I DON'T REALLY GIVE A F---."