There's an art mystery that St. Pete residents want to get to the bottom of.

Someone -- or someones -- are leaving graffiti of buttocks on walls.

Out news partners of The Tampa Bay Times report dozens of the scrawlings -- four lines forming a picture of three cheeks -- have been found since spring. There have been variations, with up to seven buttocks.

City officials are aware of the cheeky art.

For more, read The Times article.