Katy Perry tipped a girl and she liked it -- then she tipped more -- dropping STACKS on hot strippers after the Super Bowl Sunday night ... and to make it even more awesome, her BF John Mayer was there too.
We're told Katy and John stopped by Spearmint Rhino in Santa Barbara around 11pm Sunday night after the Seahawks devastated the Broncos.
We're told Katy and John spent in the thousands, tipping the girls BIG and getting multiple private dances. Katy even took photos with the girls.
Beats masturbating at home.