Joe Jonas dressed up as fiancé Sophie Turner's "Game of Thrones" character, Sansa Stark.
George Clooney wore two costumes at the Casamigos Halloween Party in Beverly Hills.
Kendall Jenner went as the "Austin Powers" fembot to the same party.
Kylie Jenner dressed up as a massive butterfly.
On Halloween, Kylie shared a second costume as a Barbie doll in the box.
Together, the Kardashian clan dressed up as Victoria Secret angels.
Khloe Kardashian and her daughter True were matching in unicorn onesies.
"Modern Family" star Sarah Hyland and boyfriend Wells Adams were a perfect combination.
"Riverdale" stars Camilla Mendes and Lili Reinhart channeled their inner "Napoleon Dynamite."
Their co-star Cole Sprouse was a "Despicable Me" minion, with a twist.
And "Riverdale" stars KJ Apa and Charles Melton dressed up as Josie and the Pussycats in leopard leotards.
Harry Styles made for a very good Elton John.
John Legend is the perfect Prince Charming for his little girl.
Rita Ora dressed up as a convincing Post Malone.
Jaden Smith rocked a Batman suit.
Halsey had her own take on Batman villain Poison Ivy.
Halsay's ex G-Eazy went as an old-school version of Batman villain Two-Face.
The "Black-ish" cast is rocking stellar "Black Panther" costumes this year.
Ciara had a "Black Panther" look of her own.
Netflix stars Ross Butler ("13 Reasons Why") and Noah Centineo ("To All The Boys I Love Before") are Wolverine and Gaston from "Beauty and the Beast."
Ryan Seacrest and his girlfriend, Shayna Taylor, dressed up as artist Karl Lagerfeld and Anna Wintour.
Kelly Osbourne went as an "American Horror Story" favorite, Myrtle Snow.
Jerry Seinfeld and his wife Jessica dressed up as the Little Red Riding Hood and the Big Bad Wolf for their shindig.
Sarah Michelle Gellar dressed up as Harley Quinn.
Gabrielle Union channeled her inner Stefani while husband, Dwyane Wade, dressed up as the Fresh Prince.
Beyoncé dressed up as singer Toni Braxton.
Neil Patrick Harris and his family went as ghosts from Disney's "The Haunted Mansion."
Katy Perry dressed up as a giant sloth to go on TV.
Jessica Alba dressed up as "Flintstones" character Betty Rubble.
Vanessa Hudgens did a fun twist on Alice in Wonderland.
"Crazy Ex-Girlfriend" star Rachel Bloom dressed up as her dog.
Mariah Carey dressed up as a sexy nurse with a pink wig.
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