The singer's clip for her new single 'S&M' premiered yesterday evening on YouTube, but has since been flagged as "inappropriate" for younger users of the video sharing website.
A message on the promo's webpage reads: "This content may contain material flagged by YouTube's user community that may be inappropriate for some users."
Users are then asked to sign up to the website and confirm their age.
Rihanna responded to the news via her Twitter page, posting: "They watched Umbrella... I was full nude."
The video, which includes the 'Rude Boy' star in a number of provocative outfits and features celebrity blogger Perez Hilton being treated as a dog, has so far been viewed more than 280,000 times.