The N Sync star was one spooktacular scary twin.
The American Idol judges adorably dressed up as a panda, sloth and eagle.
The actress got lots of laughs as she came out on Ellen as the volleyball from the movie Castaway. When Ellen asked her why she chose this costume, she said she loves the movie.
The Kylie Cosmetics founder nailed it as a Barbie doll.
Reporting for duty as Captain Merril Stubing, the host was unrecognizable.
With some sequins, The Good Morning America host pulled off the look of Dominique Deveraux from The Dynasty.
The comedian didn't dissapoint as Kelllly D., a fictional Bachelor contestant.
The actress went all for it as Gwen Stefani and posted a video of herself singing No Doubt's "Just a Girl". Stefani liked it so much she reposted it to her Instagram and wrote, "obviously this made me soooooo happy!! Gx"
With the hair and tattoos, Rita Ora morphed herself into Post Malone.
The Victoria's Secret Angel got a hold of a good make-up session to turn herself into a scary werewolf.
The Today host was unrecognizable and brilliantly hidden as Elton John.
The team dressed up as characters from the '80s. Al Roker, in the center, aced dressing up as Dr. Brown from Back to the Future.
Hearts across America melted when they saw the EGOT winner dressed up as Prince Charming while doting princess Luna.
The Beverly Hills Housewife cleverly dressed up as her friend and co-star Erika Jayne.
The couple need each other for this costume. Together, they're "Taco Bell(e)". Ha!
The Housewife looked chic as a Playboy bunny.
The father and daughter dressed up the Joker and Harley Quinn from Suicide Squad.
The co-hosts had everyone cracking up with their multiple costumes like this one inspired by I Dream of Jeannie.
The mother and daughter duo matched in unicorn onesies for True's first Halloween.
She got the Austin Powers: The International Man of Mystery role down pat and even did a little dance to the theme song, which she posted on her Instagram.
The star got creative this year.
The famous mom and daughter got into the spirit early as skeletons.
The Simple Life star kept it cute as a bunny.
The couple went made it clear they were Pamela Anderson and Kid Rock in this hilarious appearance.