Megan Fox and Machine Gun Kelly

Pamela Anderson and Tommy Lee are PERFECT, thematically, for Megan and MGK, who also played the role in the adaptation of The Dirt. It was good casting!

Rebel Wilson

Wow, Barbie really IS having a moment. This is a VERY fun costume, although best for a Standing Up party.

Molly Sims and Scott Stuber

Speaking of Barbie! (And Ken.)

Lance Bass and JC Chasez

I promised you an NSYNC reunion! JC's date was dressed as the Bride of Frankenstein, so I think we can safely assume he is Dr. Frankenstein. I do NOT know who Lance is, but he explained what happened on his Instagram: "So the idea was to be Black Sabbath Panther. Ozzy on top and Black Panther suit on the bottom. Well, right outside the party I completely ripped through the body suit. I’m sure it was because of my bulging muscles and not all the Halloween candy I’ve been eating since Oct 1. Anyways, this is all I got. The intention was pure."

Paris Jackson

I look forward to someone explaining Paris's costume to me but I WILL note that I think she looks scary and also glamorous, which is a fun combo.

Vanessa Hudgens

Vanessa's Insta implied that she is, yes, a sexy raven. This costume is pretty cool; in thumbnail, I also very briefly thought she was Bella Hadid.

Chris Tucker, Prince Michael Jackson, and Tevin Campbell

It seems like Chris and Tevin both decided ix-nay on the ostumes-cay this year.

Zoey Deutch

Zoey appears to be the Pink Power Ranger Who Got Cold and Put on a Coat. Relatable!

Maria Bakalova

This seems to fall into the I Just Put On All My Sexy Black Clothing And Then Added Ears school of costuming (a sin I myself have often committed).

Henry Golding and Liv Lo Golding

Top Gun was a somewhat popular costume, as far as I could tell, and why not? It's iconic, sexy, AND comfy.

Keegan-Michael Key and Elle Key

Speaking of iconic, sexy, and comfy.

Leslie Mann and Judd Apatow

Leslie Mann makes a GREAT Roller Girl. Is Judd Apatow is Russ Tamblyn as Dr Jacoby in Twin Peaks? That seems like a deep cut!

Kaia Gerber and Travis Jackson

Kaia looks GREAT in The Matrix.

Rande Gerber and Cindy Crawford

Sure! A classic Halloween option.

Alan Cumming and Jane Krakowski

I'm not sure what Alan is, technically, but he looks rad. Jane's costume is great. She's in bed!

Jane Krakowski

This is so clever. Also, when she gets home she can just lie down.

Maya Jama

Always pleased and impressed by the folks whose costumes are not of the Hot variety. This looks comfy!

Robin Thicke

This might be TOO comfortable.

Michael Kors

Michael Kors has seen Cats 253 times. (DON'T GET MAD AT ME I KNOW HE'S FORMAL COWARDLY LION.)

Paris Hilton and Carter Reum

At first, I thought Mr. Paris Hilton was The Phantom (of the Opera), but I think he's just....formal man in a mask squireing Sailor Moon?

Paris Hilton and Carter Reum

"Hot Cop" seems a little played out at this point.

Alessandra Ambrosio

"Okay, if we're not doing the Victoria's Secret Fashion Show anymore, I'll make my OWN Victoria's Secret Fashion Show."

Ella Balinska

"Me too!" (Although this is pretty charming on her.)

Shanina Shaik

I don't know!! Is she....Going to a Disco on a Cold Night?

Becky G

She's Salma Hayek in From Dusk Til Dawn, although I think the skirt is an addition. (One I support! Salma's costume is skimpy!)

Ryan Phillippe

We know who HE'S rooting for!

Happy Halloween! Let's Look at Some Celebrities in Costumes

Including a mini NSYNC reunion!