Kate Hudson even joined the fun in her costume as a Wild West lass, corset and all.
Could her costume be inspired by the new HBO series, West World?
Kylie Jenner brought back Christina Aguilera's 'Drrty' look to perfection...
Zendaya went as a zombie queen, and it's pretty darn creepy.
Jessica Alba and her friend Kelly Sawyer went as Edina and Patsy from Absolutely Fabulous!
Bette Midler delighted Hocus Pocus fans by dressing up as her character Winifred Sanderson!
And Amy Schumer and boyfriend Ben Hanisch geeked out with their Stranger Things costumes - Amy went as Dustin and Ben went as Eleven!