The hidden camera gag was shot at Knollwood Country Club outside L.A. earlier this month for Katy's "Birthday" video -- Katy showed a little preview on "Jimmy Kimmel Live" Monday night ... but her clip didn't include the crazy fallout.
We use cookies (or similar technologies) to measure our audience, enhance your browsing experience and provide you
with advertising based on your browsing activities and interests on this and other sites.
By clicking “accept,” you agree to such purposes and the sharing of your data with our
EHM Productions Inc. Affiliates. You can modify your cookie preferences at any time.