Ryan Seacrest & Shayna Taylor
The American Idol host and his longtime girlfriend dressed up as Karl Lagerfeld and Anna Wintour at the Casamigos bash.
Harry Styles
The "Two Ghosts" singer dressed up in a replica of Elton John's 1975 Dodgers concert outfit at the Casamigos Halloween party.
Matt Bellamy
The rock star and Elle Evans enjoy date night at treats! Magazine's 8th annual Trick or treats! Halloween party at the private residence of Jonas Tahlin, CEO of Absolut Elyx.
Brody Jenner & Kaitlynn Carter Jenner
The Hills star and his wife dressed up as characters from Scarface at the Casamigos party.
Linda Thompson & Brandon Jenner
Brandon attended the Casamigos bash alongside his mom, Linda Thompson.
Sean "Diddy" Combs
Diddy strikes a pose at the Casamigos bash.
Zoë Kravitz
Big Little Liars star attends the Casamigos Halloween bash.
Olivia Munn
Actress smiles for cameras at the Halloween celebration.
Paris Hilton
Paris strikes a pose in her costume at the Casamigos party.
Nicky Hilton
Designer appears to be channeling her sister's 21st birthday outfit for her costume.
Ross Butler & Noah Centineo
Actors share a laugh at the Casamigos Halloween party.
Lisa Rinna & Harry Hamlin
The reality star and her actor beau posed for photos at the Casamigos celebration.
Scheana Shay
Monsters and Vanderpump rules. The Bravo star gets spooked at Universal Studios Hollywood's "Halloween Horror Nights."
Erika Jayne
The Real Housewives of Beverly Hills star hosts Freixenet's annual Black Magic Halloween Party.
Christopher French & Ashley Tisdale
The couple got into the spooky spirit by hanging out at Universal Studios Hollywood's Halloween Horror Nights for a night of scary surprises.
Nicole Richie
The mom-of-two seemed to be having a good time at Universal Studios Hollywood's Halloween Horror Nights.
Daryl Sabara & Meghan Trainor
The engaged couple spent their night at Universal Studios Hollywood's Halloween Horror Nights and took a pic with some of the scary characters.
Mandy Moore & Wilmer Valderrama
Most people would agree that frightening reunions with your ex is not something to look forward to, but these two consider it tradition. Every year, the former flames attend Universal Studios Hollywood's Halloween Horror Nights together.
Alessandra Ambrosio
The supermodel and her kids, Anja Louise and Noah Phoenix, were all smiles spending the day at the Mr. Bones Pumpkin Patch.
Alec Baldwin
Proud mom Hilaria Baldwin shared this sweet photo of Alec and their daughter Carmen striking identical poses with pumpkins ahead of the holiday.
Heidi Klum & Tom Kaulitz
The former Project Runway host sported shades and a long flannel as she posed in front of a wall of pumpkins with her (hidden) kids.
Pink
The pop singer brought along Willow, 7, and Jameson, 1, to the pumpkin patch and captioned the Instagram post, "I think he's going to be a director and she's going to take it until one day she just beats the crap out of him."
Tori Spelling & Dean McDermott
It's family night for the reality stars who travel to Nights of the Jack in Calabasas, Calif. for a festive evening.
Tyler Posey & Sophia Ali
The Teen Wolf actor and Grey's Anatomy actress had a spooky third wheel on their Universal Studios' Halloween Horror Nights date.