"Pimp Down"...

...is what The Purple One was screaming Thursday night when a stan fan decided to have her way with him at a concert in London.
According to fan reports, Prince invited several people from the crowd to join him on stage. One fan got a little too close to Prince, who mockingly fell to the ground and put his hands up. That's when the fan used the opportunity to try and straddle Prince. As expected, bouncers immediately removed the woman from his Purpleness and the stage.

Source: TMZ