Even celebrities love to get in on one of Halloween's most beloved traditions — trick-or-treating. Last night, tons of stars flooded the streets of LA, NYC, and even London, to take part in the annual candy-getting tradition with their children. Some celebrities even got into the spirit by dressing up in elaborate costumes — Gwen Stefani, Modern Family's Julie Bowen, and Liv Tyler all wore getups for the spooky night. However, not all celebrities felt the need to go in disguise, as Ben Affleck and Jennifer Garner ditched their Halloween costumes in favor of comfortable clothes. Keep clicking to see all those stars and many more out on their trick-or-treating adventures.