It's Halloween and celebrities are showing off their scariest, silliest, and chicest costumes.

Kerry Washington transformed into Zendaya's character from the film “Challengers”, former tennis pro Tashi Donaldson, who wore Tashi's famous “I Told Ya” shirt from the film. She also enlisted former “Scandal” co-stars Tony Goldwyn and Scott Foley to wear tennis gear.

Washington posted an Instagram photo on Thursday of the trio posing together, reflecting the love triangles in “Challengers” and “Scandal.”

“Challenges accepted,” she captioned the funny photo.

Demi Moore also shocked fans this week by posting an unrecognizable photo of herself dressed as a much older bald woman and wearing glasses.

According to Moore, the photos were behind-the-scenes snapshots of her film “The Substance,” in which she plays a former socialite named Elisabeth who is drawn to a mysterious black market drug that promises to temporarily age her.

“I've been keeping these gems from @trythesubstance and today seems like the right day to share them. Happy Halloween from Elisabeth Sparkle,” Moore captioned the wild photos.

Check out more outstanding celebrity costumes that made us stop and marvel.

Jennifer Garner as Jenna Rink from “13 Going on 30”

Ed Sheeran as an AI-generated meme

Zooey Deschanel and Jonathan Scott as The Real Housewives of Salt Lake City stars Angie Katsanevas and Wolverine

Bindi Irwin, Chandler Powell and daughter Grace as giraffe and zookeeper

Olivia Culpo and Christian McCaffrey as Dorothy and the Tin Man from “The Wizard of Oz”