Kids, stay away from drugs and alcohol. Why? Because if you're under the influence, you'll forget that night you charged Katy Perry's stage, kissed her neck until it likely changed color and told her that the Portuguese translation for "pizza" is "pizza."

Perry, who's touring around South and Central America, invited a fan to the stage at the Rock in Rio festival in Brazil on Sunday (September 27). What she got, instead, was a totally out-of-it party girl outfitted in a smiley-face bikini who proceeded to smooch on Katy like the pop star was the only source of water for miles. There's devotion, and then there's...whatever this is.

"I think she's rolling," Katy ultimately announces to the crowd as her No. 1 continues to swarm her like a collection of hyped-up locusts. Check out the clip above for the new standard of stan-excellence.

See a collection of wild stage crashers: