Los Angeles - Rihanna stunned customers at a racy bar when she groped clubbers while wearing a raunchy outfit.
The S&M hitmaker was reportedly spotted in a leather policewoman's costume at the Bovine Sex Club in Toronto, Canada where she was said to be looking for a ''wild time''.
A source told the Daily Star Sunday newspaper: ''Rihanna was definitely on the prowl for a wild time.
''Even her bodyguards standing in a corner were gobsmacked when she approached men and women and started patting them down provocatively.''
Although the Stay singer is currently in a relationship with Chris Brown - who is still on probation after assaulting her in 2009 - it is reported the customers seemed more ''embarrassed'' than Rihanna herself.
The witness revealed: ''Some, who were standing there with their partners, seemed a bit embarrassed and one barmaid told her to get her hands off.
''But others just seemed to lap it up.''
The 25-year-old star was at the venue while she took a break from her Diamonds world tour, and she was apparently flirting with male and female customers.
The insider added: ''Rihanna told one good-looking young couple they were her 'prisoners' and started dirty dancing with them both.
''Then she ran her hands up and down their legs - and elsewhere.''