Katy Perry That's a Spicy Costume!

11/1/2014 12:02 AM PDT

Kate Hudson’s Halloween party started getting outta hand when Katy Perry showed up looking hot (flaming hot, actually) -- and went over the edge with Lily Allen's getup.

The shot she took at famed music producer Dr. Luke was neither trick nor treat ... for him -- but Kesha might be laughing.