Tabloid reports earlier today claimed that the 'Where Have You Been' singer had dropped out of an upcoming Sky Living series in the UK because of ill health.
The speculation, which came a few weeks after Rihanna tweeted a photograph of herself hooked up to a drip, claimed that the star had been "hitting it hard" for months and is now unwell.
However, Rihanna has taken to her Twitter page to call the reports "nonsense".
"I'm not sick!" she tweeted, adding: "I pushed my trip to London back to go spend time with my family! Sorry kiddos."
Rihanna also criticised the source of the reports, saying: "The Sun Newspaper is like a f**kin ass hair, full of s**t!!!!!!"
Rihanna, who has just won her 22nd Billboard Hot 100 top ten single, recently admitted that she was surprised about the response to her duet with Chris Brown.
Watch the video for Rihanna's 'Where Have You Been' below: