Celebrities are wasting no time getting in the Halloween spirit. On Oct. 24, quite a few stars stepped out in costume for Paris Hilton's annual Halloween party in Los Angeles. While Paris Jackson and her boyfriend, Gabriel Glenn, got creative by dressing up as Scooby-Doo and Shaggy, Demi Lovato went the sexy route with her insanely intricate Marie Antoinette costume (before she transformed into Pennywise the next day for another Halloween bash). Meanwhile, actress Jameela Jamil of The Good Place channeled her inner Billie Eilish as she hosted Spotify's Halloween costume pop-up event in New York City.
On Oct. 25, more stars showed up in their Halloween best for the Casamigos party in Beverly Hills. Nina Dobrev gave her own version of Billie Eilish and Jessica Biel paid the ultimate tribute to husband Justin Timberlake's *NSYNC past. The following night, Halsey and Evan Peters made their red carpet debut as a couple at American Horror Story's 100th episode party in Los Angeles where they dressed as '60s rock duo Sonny Bono and Cher. Meanwhile, some celebs are showing off their matching costumes with their kids on social media. Ahead, see some of the best celebrity costumes we've been treated to, so far.