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Katy Perry

BauerGriffin.com; AKM-GSI

"Part of Me" singer Katy Perry showed, well, a part of herself on Sunday that she probably doesn't want most people to see.

While hanging out with friends at Raging Waters in San Dimas, Calif., the songstress became the victim of a wardrobe malfunction when a day of slipping and sliding resulted in her bikini bottom doing just that.

Fortunately, Perry took the bum-baring in stride as she appeared to laugh off the rather revealing incident.

Her two-piece troubles came just hours after she and John Mayer were spotted leaving a house party in Los Feliz, thereby fueling the ongoing rumors that they might be dancing cheek to cheek dating.