Rowan Blanchard
Just call the Girl Meets World star Sailor Moon.
Ryan Hansen
Unlike Peter Pan, the actor did grow up. As for his little Tinker Bell? She ran out of pixie dust.
Simon Halls & Matt Bomer
The dads took their three sons trick-or-treating in the Big Apple.
Robbie Rogers & Greg Berlanti
The soccer player and the showrunner monkeyed around with their banana-clad son Caleb.
Tom Brady
Big Foot took hold of Fluffy, the family dog.
Sarah Drew
The Force is strong in the Grey's Anatomy star's family.
Yara Shahidi
"Call me, beep me if you wanna reach me!" The black-ish star embraced her inner Kim Possible.
Lisa Marie Summerscales & Derek Theler
Harley Quinn and Duke Nukem never looked so badass.
Gisele Bündchen
"When your son wants to be super Mario but no one wants to be Luigi," the supermodel joked. "This is what you do."
Debra Messing & Mariska Hargitay
"A HairRaising Night #Halloween @therealmariskahargitay," the Will & Grace star shared.
Taylor Swift
"Happy Halloween from Deadpool, a Cub Scout, Martha Brady, a space cadet, a granny with a lost cat, black swan, and a birthday girl dressed as a cat," the "Shake It Off" singer shared with fans.
Sean & Catherine Lowe
"HAPPY HALLOWEEN from the Addams Family," The Bachelor couple shared with fans.
Gwen Stefani
Just one day after concluding her tour, the singer is ready for Halloween night with her family.
Ariana Grande
"Look 1, Part 3: All is forgiven. More later...." the "Dangerous Woman" teased on social media.
Kate Hudson
"Not even close to going to bed," the actress wrote after wearing her Mrs. Incredible costume. "#SchoolNight #HappyHalloween."
Alicia Keys
No one, no one, no one can compete with this cuteness.
Tamar Braxton
There's this thing we love about this famous family on Halloween night.
Dave & Odette Annable
"Sucks when people don't know who you are cause you chose characters from an arthouse film," the couple wrote. "Happy Halloween to all of you beautiful people and your families #happyholloween."
Josh Grad
"I'm not proud of this. I lost a bet and this is the result. Lesson is: never bet a #kenbone on #halloween," the actor joked.
Jacob Tremblay
"I feel the need for...candy!!!" the young actor joked on Instagram. "#Maverick and #MiniMaverick! #HappyHalloween #TopGun."
Mindy Kaling
"My godson was a bee so I was a beekeeper," The Mindy Project star explained.
Neil Patrick Harris & David Burtka
The doting dads and twins Harper and Gideon made the golden age of Hollywood a family affair as Groucho Marx, Charlie Chaplin and a pint-size Marilyn Monroe and James Dean.
Giada DeLaurentiis
"Ready for trick or treating!" the Food Network star wrote. "Happy Halloween from us 2 u!"
Bethenny Frankel
"Feelin' a little catty today," the Real Housewives of New York City star wrote. "How'd we do? #halloween"