It’s not even Halloween yet, but some of your favorite celebrities are already flooding social media with photos of their spooky costumes. Many stars got on early start on the ghostly holiday by celebrating over the weekend at star-studded parties and Halloween-themed dinners.

On Friday, Kylie Jenner and her boyfriend Tyga kicked off the Halloween festivities by throwing a “Dead Dinner” for their family and friends. The 19-year-old lip kit creator rocked skeleton makeup for her dinner, while Tyga wore a skeleton mask. The couple was joined by several of their close pals including model Jordyn Woods who gave fans a peek at her costume on Instagram, and Kourtney Kardashian who was also a skeleton. Jenner later posted another costume photo to Instagram, but this time she was Christina Aguilera from her “Dirrty” music video.

Mariah Carey also threw her own Halloween bash, and attended the party in a sexy devil costume. The singer’s two kids were in attendance, as well as her ex-husband Nick Cannon, who stepped out as one of the Super Mario Brothers.

On Saturday, Bette Midler hosted a Halloween party for several of her A-list friends. The actress and singer decided to give a throwback to the Halloween cult classic “Hocus Pocus,” by dressing up as her character Winifred Sanderson. Among those attending Midler’s soiree was designer Marc Jacobs, who looked unrecognizable as a muscled man in a tiny bikini. Kathy Griffin also made an appearance at Midler’s party as a Snapchat filter.

The celebrity parties didn’t end there. At Kate Hudson’s annual Halloween party, Katy Perry was crowned best costume of the night by dressing up as Presidential candidate Hillary Clinton. Jessica Alba was also spotted at the party, and decided to bring her BFF Kelly Sawyer along. The friends were drunk versions of Patsy and Edina from the British sitcom “Absolutely Fabulous.”

Other celebrity Halloween costumes include “Room” star Jacob Tremblay as Marty McFly from “Back to the Future,” Abigail Breslin as Harley Quinn from “Suicide Squad,” model Alessandra Ambrosio as Jessica Rabbit and Nina Dobrev as the horse from “The Revenant.” You know, the one Leonardo DiCaprio’s character slept in to escape the frigid cold weather. Singer Zara Larsson also donned a cool costume, stepping out as “Disco” Scar from the “Lion King.” In the caption, she wrote: “When you give em that ‘I just killed my brother, Mufasa look.’ #circleoflife.”

Check out some of this year’s celebrity Halloween costumes  below.