Fancy dressed celebrities were everywhere to be seen last night!
Heidi Klum threw her annual big bash and was, as usual, completely unrecognisable.
Jonathan Ross and Rita Ora also had parties. Justin Timberlake and Jessica Biel took their son trick-or-treating around Tribeca and the Kardashians had a lot of costume changes.
Here's some of our favourite celeb looks:
Heidi Klum
The Weekend & Bella Hadid
Adam Lambert
Frankie Grande
Emily Ratajkowski
Winnie Harlow
David Walliams
Chris O'Dowd & Dawn Porter
Justin Timerlake, Jessica Biel & Silas
Georgia Steel
John Legend & Chrissy Teigen
Beyonce & Jay Z
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Jenna Dewan
Reese Witherspoon
The Cast of Stranger Things
Anne Hathaway
Kim Kardashian
Khloe Kardashian & True
Kylie Jenner
Kourtney Kardashian
Kendall Jenner
Saint & North West and Reign & Penelope Disick