Kylie Jenner & Travis Scott
The couple posed with their daughter Stormi and 8-month-old son.
Olivia Munn
Her and John Mulaney's son Malcolm dressed up as her mom, Kim Munn, complete with a black wig.
Lea Michele
Her son Ever went as a surgeon (more specifically, Grey's Anatomy's McDreamy).
Gwyneth Paltrow
The Goop founder rocked a Winnie the Pooh look.
Billie Eilish
The singer showed off her fake blood on her Instagram Story.
Kendall Jenner
Kendall made fun of her own #cukegate episode of The Kardashians by dressing as a cucumber.
Amelia Hamlin
"Monkey Business," the model wrote on Instagram while visiting Richie Akiva's The Ned NoMad over Halloween weekend.
Nick Viall & Natalie Joy
"We have our differences but we make it work," The Bachelor star joked on Instagram.
James Charles
"This is what dreams are made of," the YouTube star wrote on Instagram when channeling Lizzie McGuire.
Blake Gray
"The first rule of fight club is..," Blake wrote online, "you do not talk about fight club."
Cassie & Alex Fine
The singer and her husband Alex Fine drew inspiration from another couple, Angelina Jolie and Billy Bob Thornton.
Travis Barker & Kourtney Kardashian
The Kardashians stars looked frighteningly good as Chucky and his Bride for the spooky day.
Mindy Kaling
"Can you guess who I am for Halloween this year?" the actress wrote on Instagram.
Jonathan Bennett
The Mean Girls star hosted Boo2Bullying's 4th Annual BOO BALL Halloween Fundraising Gala at SLS Hotel Beverly Hills.
Abby De La Rosa
Pregnant Abby De La Rosa and her 16-month-old twins Zion Mixolydian and Zillion Heir, who she shares with Nick Cannon, dressed up as characters from The Wizard Of Oz.
Ryan Seacrest
The On-Air With Ryan Seacrest radio host makes one perfect Harry Styles.
Mariska Hargitay
"Happy Halloween," the Law & Order: SVU star wrote. "#IPaintFlowersSoTheyWillNotDie #FridaKahlo #FemaleArtist #Realism #CelebrateTheArts #InnerStrength #OutfitOne."
Tamron Hall
The talk show host took us under the sea for Halloween when she dressed up as Ariel from The Little Mermaid.
Jennifer Hudson
La la la la la la! Jennifer Hudson stepped into the shoes of the iconic Sister Mary Clarence from Sister Act (played by none other than Whoopi Goldberg).
Today Show Cast
The Today show cast went all out when it came to celebrating Halloween with a Las Vegas theme.
Hoda Kotb
As a treat, Hoda showed off had quite a few tricks up her sleeve as a Cirque du Soleil performer.
Sean "Diddy" Combs
Holy smokes, Batman! Diddy dressed up as the Joker.
Sheinelle Jones
The journalist shined as a Las Vegas showgirl for the spooky occasion.
Savannah Guthrie & Hoda Kotb
The Today show hosts soared to new heights as Cirque du Soleil performers.