The 'We Found Love' hitmaker sparked controversy after sharing a snap of herself at the California music festival in April sitting on a security worker's shoulders and pouring a mystery substance onto his scalp, reported digitalspy online.

"They knew what it was. They knew it was marijuana. It was completely clear to them. I just thought it was uncalled for. I don't do cocaine. I don't like being associated with anything that's untrue," she said.u00a0

Rihanna. Pic/Santa Banta