On the weekend of August 12, while enjoying a day out with her pals at the water park, the attractive vocalist behind the hit “California Girls” had an embarrassing incident that left her backside exposed to a crowd of onlookers.

Katy Perry and her buddies had a fun day out at Raging Waters water park in San Dimas, CA on August 12. Interestingly, she was not accompanied by her speculated beau John Mayer. Prior to this, Katy was seen having a meal with the singer-songwriter who is known for his floral attire.

The attractive vocalist donned a bikini with a striking black and white design that accentuated her curves. Meanwhile, a bunch of pals headed to the skate park with a swarm of photographers in tow.

Katy hesitated for a bit, but then she mustered the courage to lie down on the skateboard and glide it into the water.

As soon as she appeared, people couldn’t help but notice the beauty’s behind on display, but it wasn’t intentional. She had her pants down and was in the midst of a crowd.

The camera managed to capture the beauty’s disclosure.

Katy received some friendly assistance from a male friend recently. She’s been spending her free time hanging out with friends, including John Mayer. Interestingly, back in November 2010, before she had met and married Russell Brand, Katy and John flirted with each other.