HGTV fans quickly recognized the pair as Flip or Flop's Christina Anstead and Tarek El Moussa.
Smile! Seacrest dressed up like the Joker and did a little makeup tutorial.
This Halloween was a "memory" Ripa will never forget, especially with this Cats costume.
The host jokingly created a trailer for a Cats sequel called Bats.
Did someone say Pennywise? Seacrest turned the creepy clown into a YouTube makeup artist.
The celebrities took a little inspiration from Lil Nas X and took their horses to the Old Town Road.
Ripa gave a nod to Drew Barrymore's Scream character with this look.
The Addams Family was ready for these frightful festivities.
Ripa was just a Barbie girl living in a Barbie world.
The stars were ready to ride into another year of terrific costumes with these cowboy and cowgirl getups.
Houghton recreated Mother Monster's latest Met Gala look.
The co-host was feeling "good as hell" while dressing up like Lizzo.
What a heavenly look! The TV star replicated Katy Perry's Met Gala ensemble.
Take a bow, Mai! The celebrity totally nailed Rihanna's Met Gala look.
Talk about a fun and fabulous group!
The co-hosts went as characters from Stephen King's stories.
Huntsman went as Carrie and got covered in fake blood.
The star went as Church from Pet Sematary.
The TV host went as Pennywise from It.
These two ladies went as the Grady twins from The Shining.
The co-hosts went all out for their annual Rocktober Lip Sync War. Sheryl Underwood won the competition after dressing up like Barry White. Carrie Ann Inaba also rocked out as Jennifer Lopez; Sharon Osbourne performed as Stevie Nicks; Eve went as RuPaul and Marie Osmond dressed like Gwen Stefani.