Photos: Best celebrity costumes of Halloween 2017
Heidi Klum dresses as the werewolf from Michael Jackson's "Thriller" at the Magic Hour Rooftop Bar & Lounge on October 31, 2017 in New York City.Photo by: Slaven Vlasic
"Good Morning America's" Michael Strahan dresses as Thor.Photo by: Paula Lobo
Al Roker as Willie Nelson performs during Today's Halloween Extravaganza 2017 at Rockefeller Plaza on October 31, 2017 in New York City.Photo by: Nicholas Hunt
Justin Timberlake and Jessica Biel dress as Buzz Lightyear and Jesse from "Toy Story."
Holly Madison dresses as Eleven from "Stranger Things."
Usher dresses as the Night King from "Game of Thrones."
"Good Morning America's" Ginger Zee dresses as Baby Groot from "Guardians of the Galaxy."Photo by: Paula Lobo
Heather Graham attends Heidi Klum's 18th annual Halloween Party presented by Party City at the Magic Hour Rooftop Bar & Lounge on October 31, 2017 in New York City.Photo by: Slaven Vlasic
Amber Rose and her son dress as Chucky and Tiffany from the "Child's Play" series.
Nas dresses as Richard Pryor.
Savannah Guthrie as Kenny Rogers and Matt Lauer as Dolly Parton perform during Today's Halloween Extravaganza 2017 at Rockefeller Plaza on October 31, 2017 in New York City.Photo by: Nicholas Hunt
Cindy Crawford (L) and Rande Gerber attend Casamigos Halloween Party on October 27, 2017 in Los Angeles, California.Photo by: Michael Kovac
Mark Ruffalo poses with "Good Morning America's" Robin Roberts, Lara Spencer, Amy Robach and Michael Strahan.Photo by: Paula Lobo
Carson Daly as Billy Ray Cyrus, Megan Kelly as Shania Twain, Savannah Guthrie as Kenny Rogers and Matt Lauer as Dolly Parton, Kathie Lee Gifford as Miley Cyrus, Hoda Kotb as Blake Shelton, Al Roker as Willie Nelson and Billy Ray Cyrus perform during Today's Halloween Extravaganza 2017 at Rockefeller Plaza on October 31, 2017 in New York City.Photo by: Nicholas Hunt
Sarah Michelle Gellar and Freddie Prinze Jr. dress as Andie and Duckie from "Pretty in Pink."
"Good Morning America's" Lara Spencer dresses as Black Widow from "The Avengers."Photo by: Paula Lobo
Jon Batiste attends Heidi Klum's 18th annual Halloween Party presented by Party City at the Magic Hour Rooftop Bar & Lounge on October 31, 2017 in New York City.Photo by: Slaven Vlasic
Kourtney Kardashian and Kim Kardashian dress as Michael Jackson and Madonna from the 1991 Academy Awards.
Khloe Kardashian and Tristan Thompson dress as Daenerys Targaryen and Khal Drogo from "Game of Thrones."
Gabrielle Union and Dwyane Wade dress as Milli Vanilli.
January Jones dresses as Rapunzel from "Tangled."
Hayley Erbert and Derek Hough.