Rihanna has come under fire after posting a picture online of her with what appears to be white powder.

In the snap added to photo-sharing website Instagram, the 24-year-old ‘S&M’ singer can be seen sat on her bodyguard’s shoulders appearing to ‘cut up’ an unidentified substance on the top of his shaved head.

Taken at last weekend’s Coachella festival in California, the image has caused outrage amongst some web users, attracting more than 1,000 comments, with some suggesting she was rolling a joint, and other speculating it was cocaine. One wrote: “Yep take coke! U gonna die,” while another added, “Chick looks like a druggie.” One person even expressed fears the star could be heading the same way as the late Whitney Houston. The fan wrote: “I love her music, not her lifestyle. Hope she gets this under control before we have her funeral on TV like Whitney Houston.” A parent of one of her younger followers added: “I have a ten-year-old daughter who loves her, and I wouldn’t want my child seeing this.”

Rihanna has previously insisted she does not want to be a role model for any body, and recently updated her twitter page with: “I’m crazy, and I don’t pretend to be anything else.”

It does appear that it could be what everyone thinks it is and it will be hard for RiRi to sidestep this one. We would love to hear what you think about it, Is it ok for Rihanna to do as she pleases in the public eye or does she need to show a little more control? Leave your comments here or hit us up on Twitter & Facebook.