To get into the spooky spirit, Hollywood A-listers took to social media on Saturday to celebrate Halloween.

Kim Kardashian, Channing Tatum and Reese Witherspoon are among celebrities who partook in suiting up in new costumes, posting funny photos or throwing it back to childhood memories on Oct. 31. See the festive Twitter and Instagram posts below.

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Happy Halloween GoZZqac1hy

— Kim Kardashian West (@KimKardashian) October 31, 2015

Happy Halloween! aMkvvElRKy

— Kourtney Kardashian (@kourtneykardash) October 31, 2015

TYYAU3xcDB

— Kourtney Kardashian (@kourtneykardash) October 31, 2015

Happy Halloween!!

— Kylie Jenner (@KylieJenner) October 31, 2015

best costume I’ve seen so far!!

— Amber Rose (@DaRealAmberRose) October 31, 2015

Feeling like a @VictoriasSecret angel today. #HappyHalloween! Some of my best costumes:

— Larry King (@kingsthings) October 31, 2015

Found my costume! What are you guys gonna be for Halloween??

— DANIEL NEWMAN (@DanielNewman) October 31, 2015

Happy Halloween

— Ricky Gervais (@rickygervais) October 31, 2015

Happy Halloween kids

— Ricky Gervais (@rickygervais) October 31, 2015

Jenna’s tiny hat. Makes me laugh every time.

— Channing Tatum (@channingtatum) October 31, 2015

HAPPY BEST DAY OF THE YEAR EVERYONE

— Ariana Grande (@ArianaGrande) October 31, 2015

We dressed up @hitRECord & we’re always gonna dress up cause it’s my favorite day #Halloween

— Joseph Gordon-Levitt (@hitRECordJoe) October 31, 2015

Kim Possible and the Pink Ranger teaming up last night. #Kellivia #PimRossible #Halloween

— Olivia Holt (@olivia_holt) October 31, 2015

Happy Halloween! #CobraKai

— Jenny McCarthy (@JennyMcCarthy) October 31, 2015

Happy Halloween

— backstreetboys (@backstreetboys) October 31, 2015

We’re ready for ya trick-or-treaters!! Happy Halloween !!!

— Reese Witherspoon (@RWitherspoon) October 31, 2015

Happy Halloween #beautyandthebeast

— Emma Watson (@EmWatson) October 31, 2015

Not gonna lie, I’m loving seeing all of your #ErinLindSLAY Halloween costumes. You guys are awesome! Happy Halloween!

— Sophia Bush (@SophiaBush) October 31, 2015