It might have something to do with your still-married butt stepping out in public with Sienna Miller after getting busted groping her sunburt cans on the high seas.

E! reports Balthy and Sienna were casually sauntering through the Country Mart shopping center Thursday in Malibu, their sin enclave of choice these days.

"At one point, the two took off in different directions... Perhaps they were a bit nervous that paparazzi were looming."

Poor Balathazar. Every time he looks the other way, the action goes down.

Call it karma.