Celebrities (usually) look camera-ready perfect, so it's a nice change to see them step outside the Hollywood bubble and go all out in costume (some more than others). Gory or ridiculous, these celebs live for the shock factor!

The Hills reality stars, "Speidi", poke fun at another reality couple. 3 guesses?

Tyra as Kim Kardashian is not very exciting, but she does look fabulous! With the hair, camera angle, lighting and a quick glance Tyra's disguise would make anyone do a double take.

Seal and Heidi Klum aren't afraid to go all out. They are so ridiculously cute and in love it makes me gag a little.

Petra Nemcova wants to "walk like an Egyptian"...

... while Paris' sexed-up army outfit is so expected.

Seriously, Mario Lopez has no shame. If you've got it why not flaunt it, right? The security officer doesn't seem to mind ;)

Firefighters are definitely sexy, but leave it to Mariah Carey to make it look downright trashy.

It's like looking at a car crash. You want to look away but you just can't!

I love Gwen Stefani, but as a style icon I expected a little more than sunny-side up. How does she still manage to look chic?

Yes Britney, this is very scary. We're completely baffled about what your costume is, even.

Hills star, Audrina Patridge, in a classic '80s Madonna get-up. It's unimaginative but I love it!

Say it with us: awwwww!