Katy Perry 'Rolling' Fan -- I Wasn't High!!!

The "rolling" Brazilian fangirl who made headlines for groping Katy Perry at Rock in Rio over the weekend tells TMZ she wasn't high or drunk ... just tired when Katy brought her up onstage.

Rio native Rayane says she'd been up since 4:30 AM and waited 12 hours in line for Katy's concert. The mix of excitement and exhaustion made her seem drunk, when she was stone cold sober.

Despite the language barrier, Rayane says she understood everything Katy was saying.

As for the heavy petting ... Rayane claims she couldn't stop hugging and smelling Katy .... but that was all about excitement, not alcohol.

She adds, "Her skin is very soft.”

Brazilians ... just more open about their affection.