The couple posed with their daughter Stormi and 8-month-old son.
Her and John Mulaney's son Malcolm dressed up as her mom, Kim Munn, complete with a black wig.
Her son Ever went as a surgeon (more specifically, Grey's Anatomy's McDreamy).
The Goop founder rocked a Winnie the Pooh look.
The singer showed off her fake blood on her Instagram Story.
Kendall made fun of her own #cukegate episode of The Kardashians by dressing as a cucumber.
"Monkey Business," the model wrote on Instagram while visiting Richie Akiva's The Ned NoMad over Halloween weekend.
"We have our differences but we make it work," The Bachelor star joked on Instagram.
"This is what dreams are made of," the YouTube star wrote on Instagram when channeling Lizzie McGuire.
"The first rule of fight club is..," Blake wrote online, "you do not talk about fight club."
The singer and her husband Alex Fine drew inspiration from another couple, Angelina Jolie and Billy Bob Thornton.
The Kardashians stars looked frighteningly good as Chucky and his Bride for the spooky day.
"Can you guess who I am for Halloween this year?" the actress wrote on Instagram.
The Mean Girls star hosted Boo2Bullying's 4th Annual BOO BALL Halloween Fundraising Gala at SLS Hotel Beverly Hills.
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.
The On-Air With Ryan Seacrest radio host makes one perfect Harry Styles.
"Happy Halloween," the Law & Order: SVU star wrote. "#IPaintFlowersSoTheyWillNotDie #FridaKahlo #FemaleArtist #Realism #CelebrateTheArts #InnerStrength #OutfitOne."
The talk show host took us under the sea for Halloween when she dressed up as Ariel from The Little Mermaid.
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).
The Today show cast went all out when it came to celebrating Halloween with a Las Vegas theme.
As a treat, Hoda showed off had quite a few tricks up her sleeve as a Cirque du Soleil performer.
Holy smokes, Batman! Diddy dressed up as the Joker.
The journalist shined as a Las Vegas showgirl for the spooky occasion.
The Today show hosts soared to new heights as Cirque du Soleil performers.