Getty/Michael Loccisano; Instagram/Mariah Carey, Getty/Michael Kovac; Instagram/Colton Haynes
From left: Bette Midler, Mariah Carey, Seth MacFarlane, and Colton Haynes.
It's always fun to see how celebrities dress up for Halloween - and 2016's crop of costumes didn't disappoint.
Here's a list of 31 stars who dressed up for Halloween this year. We'll keep updating this post as more photos become available.