Common knowledge dictates that people like to present the most attractive versions of themselves to the world. One would therefore guess that - especially when going out in public on a holiday - gorgeous celebs want to look as smoking hot as possible. Well, not these five folks. This Halloween, these famous hotties chose to wear unflattering, unattractive, and sometimes downright frightening costumes. (We're hoping that, eventually, we'll be able to get these images out of our heads…) Check 'em out.

Demi Lovato as a zombie

Photo: (left) Christopher Polk/ Getty Images | Licensed to Alpha Media Group 2013 (right) Courtesy of Fox

We almost got aheart attackwhen we saw the former Disney queen's spooky getup.

Nicole Richie as Danny DeVito in Twins

Photo: (left) Courtesy of Instagram (right) Jason Merritt/ Getty Images | Licensed to Alpha Media Group 2013

She and a friend dressed up as the mismatched brothers played by DeVito and Arnold Schwarzenegger in the funny flick from 1988. Wonder if her Simple Life twin Paris Hiltonwas jealous?

Heidi Klum as a 100-year-old woman

Photo: (left) Mike Coppola/ Getty Images (right) Astrid Stawiarz/ Getty Images | Licensed to Alpha Media Group 2013

It was a costume for the ages for the German supermodel.

Cindy Crawford as Slash

Photo: (left) Jerod Harris/ Getty Images (right) Gustavo Caballero/ Getty Images | Licensed to Alpha Media Group 2013

We'll never look at a giant top hat the same way again. Thanks, Cindy!

Matt Lauer as Pam Anderson

Photo: (left) D Dipasupil/ Getty Images (right) Steve Granitz/ Getty Images | Licensed to Alpha Media Group 2013

The Today Show host done up as the Baywatch babe is truly the stuff nightmares are made of.

Photos by Photo: (left) Mike Coppola/ Getty Images (right) Astrid Stawiarz/ Getty Images | Licensed to Alpha Media Group 2013