Katy Perry should have heeded that old show-biz maxim, “Never work with children or animals.”

Perry appears in a photo-shoot in the latest issue of Miss Behave magazine, and blogged about the honor of being shot and dressed by photographer/designer Jeremy Scott for the issue.

The only problem is that there was a chimp on the set that day.

Who relieved herself on the “I Kissed a Girl” singer. Eww.

“I had a chimp on set with me that day…fun fact, she peed all over me, I had to take [a] silkwood shower in the middle of shooting,” she blogged.

If you’ve never seen Silkwood, Meryl Streep plays a nuclear power-plant worker who is discovered to be contaminated and has to be scrubbed down in a raging hot shower with big brushes.

Which would be the proper response to getting peed on by a chimp.

Maybe she should have licked her simian enemy to set him at ease?

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