Katy Perry Makes "The Simpsons" Worth Watching (Briefly)

I wasn't impressed at all by Sunday's "Simpsons" Christmas episode (which took the form of a Treehouse of Horror anthology), but then Katy Perry showed up with her gravity-defying rack in a red vinyl dress that appeared to be worn as a second skin.

So, rather than subject you to the whole episode, here's the only part worth watching: