I was really disappointing that this year one of my favorite Hollywood hotties at the moment Hayden didn't appear anywhere in a slutty Halloween costume, so I'll just go with the next best thing- Hayden looking sexy and stunning in a really, really short dress...
See also:
Hayden Panettiere Photo Gallery
Hayden Panettiere Has Cute Little Cleavage!
Hayden Panettiere Sings!