Fashion is all about dressing up, so if anyone should go all out on Halloween, it's models, designers, and their assorted friends. And many of them did for their various parties. Our personal favorite was Michael Kors, but Heidi Klum, Christian Siriano, and Rogan Gregory also looked pretty great. See their costumes and more in the slideshow.
Stunning attention to detail, but we're a bit lost: Since when did Ariel grow boobs on her hips?
This is the kind of costume you wear when you don't have one. Charlotte may say she is a cat, but she is really herself with a weird headband and face paint.
Halloween may be the only day that lends itself to wearing orange, matted-fur dresses.
This is cool because you can't really tell who he is. But it's kind of flawed, because on the other hand, what is he?
Martha wore her sensible black pumps.
Kelly Osbourne and Luke Worrall
Bacon and eggs covered in glitter. Amazing. This must be what Gaga eats for breakfast.
And speaking of! But hey, it's Halloween. Some people have to fill the scary quotient.
Rachel Zoe went as ... Rachel Zoe. Possibly the tree version of herself.
Seal and Heidi Klum
Heidi has a giant beak on her head. No word on whether she went around pecking people with it, but how could she not? No one's that mature.
Either she's pushing them together or that is a magical, magical corset top.
If we ever imagined what Santino would wear on Halloween, this would probably pretty much be it.
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