Boo-tiful Celeb Kid Halloween Costumes!

Kim Kardashian and Kanye West's oldest child got to dress up as Wilma in the family's Flintstones group costume.

John Legend and Chrissy Teigen's daughter bippity-boppity-booped her way through Halloween as the Fairy Godmother from Cinderella. While Luna looked adorable, her parents' commentary on Legend's Instagram post was hilarious. The EGOT winner accidentally captioned the pic, "Bippity bippity bop," to which Teigen commented, "It’s bippity boppity boo u absolute dork."

Steph and Ayesha Curry's three kids joined their parents in Toy Story gear.

Chelsea Houska's cute brood was all smiles in their costumes: a mermaid, a chicken and a cowboy.

Little Willa, who was dressed up as Ariel, gave her dad -- Thomas Rhett, who was in a Prince Eric costume -- a kiss on the cheek. Rhett and wife Lauren Akins' other daughter, Ada, rocked a Flounder suit to round out the Little Mermaid vibes. 

For his son's first Halloween, Andy Cohen happily put on a Snoopy suit to have a matching father-son costume with Benjamin, who was rocking a Woodstock outfit.

"I have a lot of explaining to do to our daughter one day @hilaryduff," Matthew Koma joked of his daddy-daughter storm cloud costumes.

Jade and Tanner Tolbert dressed up as two of Hocus Pocus' three Sanderson sisters, with Emmy rounding the group out as the third and baby Brooks dressing up as black cat Binx.

Rose Byrne and Bobby Cannavale joined their sons in dressing up as Coco characters.

Jeffrey Dean Morgan and Hilarie Burton's son was out of this world as David Bowie, while their daughter got witchy with her costume. "Sweet daddy made it home for Trick-or-Treat! Everything is infinitely better with @jeffreydeanmorgan at home. Raising these weird, wonderful kids with you is all I ever wanted. My phone says we walked 2.5 miles yesterday, and you carried a sleepy baby witch the whole way. #Ziggy and I bequeath all the chocolate to you!!! Xxx," Burton wrote on Instagram.

Nick and Vanessa Lachey's youngest son monkeyed around as Abu from Aladdin.

Eva Longoria made the cape for her baby boy's vampire costume.

Just like the previous year, Halloween 2019 brought a slew of costumes for Khloe Kardashian's daughter, including a bee, Jack o'lantern, lion, Oompa Loompa and swan.

Jessica Simpson's two oldest kids hit the high notes in their School of Rock outfits.

"Pineapple chunk on the floor. Still good. 5 second rule. #happyhalloween?," Gabrielle Union joked of her daughter's pineapple onesie.

Kim Kardashian West and Kanye West's daughter was seeing red as the devil while Kourtney Kardashian and Scott Disick's daughter was a half-devil, half-angel. A family friend's daughter rounded out the trio as an angel.

Nicole 'Snooki' Polizzi's baby boy didn't even seem to notice his mom's scary Venom mask, but that could be because he was the world's cutest Spider-Man. "Venom gave birth to a healthy baby Spider-Man ❤️??," the Jersey Shore Family Vacation star joked on Instagram.

Both mom and daughter were very excited about Birdie's Mean Girls costume. "Her name is Regina George and she is a massive deal.? #meangirls #meangirlsbroadway ?," Busy Philipps captioned her Instagram post.

How meta is this? Tamron Hall dressed her son Moses up as the actual Moses for a very cute appearance on the Halloween episode of the Tamron Hall Show.

Off to Graceland! Jade Roper Tolbert and Tanner Tolbert joined their kids as hound dogs, with the whole family dressing up as Elvis Presley!

Ciara's kids have got their mama's musical talent! The "Thinkin Bout You" singer's and husband Russell Wilson's daughter and Ciara's son with her ex, Future, got their groove on as the Jacksons.

Little Stormi dressed up as her mama, Kylie Jenner, donning a miniature version of the head-to-toe lilac look that the makeup mogul wore to the 2019 Met Gala -- complete with a purple wig! "My baby!!!!!!!! ??????????? i cant handle this!!!!" Jenner wrote on Instagram.

Bachelor Nation couple Sean Lowe and Catherine Giudice's sons looked too cute as a dinosaur and a skunk. 

Kehlani's baby girl looked too precious in her avocado costume. "Holidays are 10x better with my Adeycado," the "Good Times" singer captioned the cute Instagram pic of her and her daughter celebrating Halloween together.

Tarek El Moussa gave a peek into "dad life" when he shared how his matching dog costume with son Brayden came to be. "So I asked Bray 'what do you want daddy to be for Halloween' he says Paw Patrol. I told @heatherraeyoung to get me something from paw patrol," the Flip or Flop star explained. "Little did I know I would be an overheated cow or dog or whatever I am lol. Anyone dressing up with their kiddos for Halloween!??‍♂️?‍♂️. Mr. handsome looks so cute ❤️❤️❤️."

It's never too early to celebrate for Gabrielle Union! The L.A.'s Finest star was very eager to get her lil' pumpkin in costume for her very first Halloween, outfitting Kaavia in a Jack o'Lantern costume that's sure to be just one of many. "Soooo Oct 10th ISNT Halloween?!?! So why am I dressed as a lil pumpkin... you know what, nevermind. I already know, those 2 eager beaver fools," read the goofy Instagram caption.

Kim Kardashian West and Kanye West's daughter as a lamb.

Amber Stevens and Andrew J. West's daughter as a penguin from Mary Poppins (mom went as Mary, while dad was Bert).

Justin Timberlake and Jessica Biel's son as LEGO Batman (with dad as his sidekick, Robin).

Alec and Hilaria Baldwin's daughter and sons as astronauts.

Chelsea Houska and Cole DeBoer's oldest daughter as a magical faun, youngest daughter as a woodland baby deer, and son as a dragon.

Megan Fox and Brian Austin Green's sons as a unicorn, a zombie cheerleader and a lizard.

Jennifer Lopez and Marc Anthony's daughter as a cow.

Kim Kardashian West and Kanye West's son and Kourtney Kardashian and Scott Disick's son as Kanye West and Lil Pump in the "I Love It" music video.

Kristen Schaal and Rich Blomquist's daughter as Schall's Bob's Burger character, Louise Belcher (and her husband as Bob Belcher!).

Sara and Lee Brice's daughter and sons as a princess, his singer-songwriter dad Lee, and a firefighter.

Jennifer Lopez and Marc Anthony's son as The Joker.

Mindy Kaling's daughter as a lion.

Pink and Carey Hart's son as a pirate.

Fergie and Josh Duhamel's son as a Power Ranger.

Lauren and Thomas Rhett Akins' daughters as Monsters Inc. characters.

Kristin Cavallari and Jay Cutler's sons and daughter as Mario, Luigi and Princess Toad from Super Mario.

Jenni 'JWoww' Farley and Roger Mathews' daughter and son as characters from Moana.

Jessie James Decker and Eric Decker's son as a puppy.

Brandi Carlile and Catherine Shepherd's daughter as Saturn and son as an alien (as were both moms!).

Andrew McMahon and Kelly Hansch's daughter as Sophie from Mamma Mia.

Nicole 'Snooki' Polizzi and Jionni LaValle's daughter and son as Superwoman and Venom.

Jana Kramer and Michael Caussin's daughter as a witch.

Neil Patrick Harris and David Burtka's twins as characters from Walt Disney World's The Haunted Mansion ride (as were their dads!).

Eva Longoria and José Bastón's son as Superman.

Matthew Morrison and Renee Puente's son as the Stay-Puft Marshmallow Man.

Tom Brady and Gisele Bundchen's daughter as a unicorn.

Kevin Hart's son and daughter from a previous marriage and son with wife Eniko Parrish as minions.

Alyssa Milano and Dave Bugliari's daughter as Wonder Woman.

Lauren Conrad and William's son as a blackbird (with mom as Melanie Daniels from The Birds!)

Chanel Iman and Sterling Shepard's daughter as Cupid.

Jillian Harris and Justin Pasutto's son as the Mad Hatter (and their dog Nacho Cilantro as the Queen of Hearts!).

Tamera Mowry and Adam Housley's daughter as a ladybug.

as Disney's Big Hero 6's Baymax.

Molly Sims and Scott Stuber's sons and daughter as skeletons.

Catelynn Lowell and Tyler Baltierra's daughter Novalee as Cindy Lou Who.

Jason Biggs and Jenny Mollen's son as Spiderman.

Ali Fedotowsky and Kevin Manno's daughter as a chicken.

Sarah Michelle Gellar and Freddie Prinze Jr.'s daughter as Harley Quinn (dad as The Joker).

Jamie Otis and Doug Hehner's daughter Jack-Jack Parr (the whole family dressed up as characters from The Incredibles).

Jenna Bush Hager and Henry Chase Hager's daughters as candy queens.

Ashley and Jason Wahler's daughter as Little Red Riding Hood.