But one child we didn't expect to see publicly joining the fun was Mindy Kaling's daughter, Katherine.
Since giving birth to her first child in December 2017, the actress hasn't posed any photos on social media, likely to protect her little girl's privacy.
But for Halloween, we got our first glimpse as Katherine, who was dressed as a lion for the day and facing towards her mustard bottle mother:
"Happy Halloween from this bottle of mustard and her little lion ❤️🦁🎃," Kaling captioned the adorable photo.
When asked by a fan via Instagram Stories whether Katherine enjoyed her first Halloween, Kaling replied, “Yes! She loved grabbing candy from bowls, but didn’t eat any!”
Kaling spoke openly about her pregnancy for the first time in August, saying on NBC's Today show that she was "really excited" to become a mum.
"I'd like to be the fun mum, I know I'm gonna be the dorky mom," she added. "So if I can be kind of fun too, I think that would be nice."