Here's what 31 celebrities wore for Halloween this year

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. 

Actor Mario Lopez was Tony Manero from "Saturday Night Fever."

Actress Hillary Duff and her boyfriend Jason Walsh were criticized for dressing up as a Native American and a Pilgrim.

The costume was viewed as an insensitive appropriation of Native American culture. Both Duff and Walsh have already apologized for the choice. 

Actor Kelsey Grammer portrayed Sideshow Bob, a character from "The Simpsons."