'Wasted' woman gets grabby with Katy Perry onstage at Rock in Rio: 'This girl is rolling'

A heavily intoxicated woman got onstage during Katy Perry's performance at Rock in Rio on Sunday night and predictably things got messy.

Watch the clip above to see the woman - named Rayane or Raiaiaia, as Katy pronounced it - greeting the singer with an intense hug that quickly turned into a boob nuzzle.

Things quickly escalated from there, as Katy, 30, fended off the many advances of the woman before giving her a firm slap on the butt when she finally left the stage.

Yep, it's the best thing we've seen all week.

Katy later took to Twitter to blame a "super moon" for the bizarre vibes on the Brazil stage.

Meanwhile, a selfie taken by the fan onstage has emerged online and it shows the full extent of Katy Perry's terror… 

She looks like she's about to cry!