A lot of people chose this look.
Last month, it was predicted that Eleven from Netflix show Stranger Things would be the most popular Halloween costume this year.
And while plenty of people are opting for Harley Quinn and Snapchat Filters, it seems the top spot definitely goes to this character.
So many people donned peter pan collared dresses and bald caps in fact, that Millie put together a collage of all of her favourites.
https://www.instagram.com/p/BMMGXxoBrv1/?taken-by=milliebobby_brown
Everyone from women and men to little babies are dressing up as Eleven and she appreciates it, apparently.
”you guys are killing me with your 011 costumes this Halloween” She said under the photo.” she said on Instagram.
So if this is your go-to costume this year, make sure to upload a photo to Instagram and Eleven herself might see it!