The celebrity world loves a good Halloween dress up and even though the official holiday isn’t until Tuesday the star-studded bashes and costume snaps on Instagram kicked off this weekend.

The likes of Vas J Morgan and Kendall Jenner have been hosting lavish parties inviting all their famous friends while other have showed off looks on socials.

And this year the costumes have been just as wild as ever with the stars taking inspiration from their favourite characters, while some appear to have only made minimal effort.

So here MailOnline has compiled a list of the best and worst dressed of the spooky season so far:

 BEST DRESSED:KOURTNEY KARDASHIAN

Halloween outfits: Kourtney Kardashian kicked off Halloween weekend by revealing her epic Halloween costume that involved transforming into her sister Kim

Seeing double! The POOSH founder, 44, (left) showed off her baby bump in the same skintight floral Riccardo Tisci that Kim, 43, (right) wore to the 2013 Met Gala while heavily pregnant

Kourtney Kardashian kicked off Halloween weekend by revealing her epic Halloween costume that involved transforming into her sister Kim.

The POOSH founder, 44 showed off her baby bump in the same skintight floral Riccardo Tisci that Kim, 43, famously wore to the 2013 Met Gala while heavily pregnant with her daughter North West, now 10.

The SKIMS CEO’s look was absolutely savaged online, with many ruthlessly comparing her to grandma-worthy couch as well as Robin Williams‘ character from the film Mrs. Doubtfire.

In her photos shared Friday, Kourtney looked nearly identical to Kim as she slipped into the controversial dress and the matching heels Kim wore.

‘Freaky Friday,’ captioned Kourtney, in reference to the film of the same name that follows a mother and daughter who switch bodies after accidentally conjuring a spell.

PARIS HILTON

Tribute: Paris Hilton paid tribute to her close friend Britney Spears on Friday night as she dressed up as the pop icon for the Casamigos Halloween party in Los Angeles

Exact: The socialite, 42, transformed in the seductive flight attendant Britney, 41, played in the music video for her chart-topping hit Toxic back in 2003 (pictured)

Paris Hilton paid tribute to her close friend Britney Spears on Friday night as she dressed up as the pop icon for the Casamigos Halloween party in Los Angeles.

The socialite, 42, transformed in the seductive flight attendant Britney, 41, played in the music video for her chart-topping hit Toxic back in 2003.

She rocked the sexy teal Pan Am outfit that consists of a short cap-sleeve dress and a matching flight attendant hat.

Paris styled her bright blonde hair in the same long ponytail Britney wore and strolled the party’s entrance in heeled boots that matched her purse.

She was joined by her hunky husband Carter Reum, who was dressed as a pilot.

KATE BECKINSALE

That looks familiar: Kate Beckinsale looked out of this world on Saturday evening as she reincarnated one of American cinema’s most alluring science fiction characters

Ain’t nothing like the real thing: The actress revived Barbarella, the buxom space traveller made famous by Jane Fonda in the iconic 1968 film of the same name, directed by Roger Vadim

Kate Beckinsale looked out of this world on Saturday evening as she reincarnated one of American cinema’s most alluring science fiction characters.

The actress revived Barbarella, the buxom space traveller made famous by Jane Fonda in the iconic 1968 film of the same name, directed by Roger Vadim.

Dressed in the character’s famous black fitted sheer jumpsuit and carrying her very own ray gun, Kate, 50, ensured she caught the eye while attending Vas J. Morgan and Michael Braun’s star-studded Halloween party in Los Angeles.

In keeping with Barbarella’s big screen crash landing on a faraway planet, the actress embellished her outfit with large rips and smears of fake blood ahead of her appearance at the event.

She completed the look with a pair of metallic silver platform boots that conjured images of David Bowie‘s Ziggy Stardust, while heavy make-up and a tousled blonde wig rounded things off.

HAILEY BIEBER

Looking good: The animated cartoon characters were brought back to life by Hailey and Justin Bieber during an appearance at Vas J. Morgan and Michael Braun’s annual Halloween party

Wilma Flintstone never looked so good as she partied the night away with heavily tattooed husband Fred in Los Angeles on Saturday evening.

The animated cartoon characters were brought back to life by Hailey and Justin Bieber during an appearance at British blogger Vas J. Morgan and Michael Braun’s annual Halloween party, where they were joined by an array of stars.

Opting for a skin-tight PVC interpretation of prehistoric housewife Wilma’s iconic wardrobe, Hailey, 26, drew attention to her slender physique as she made her way inside the exclusive West Hollywood event.

She added to the look with a distinctive red bobbed wig, while a diamond encrusted necklace featuring the single letter B appeared to be her only notable accessory.

DEMI LOVATO

Halloween bash: Paris Hilton and Demi Lovato put on their best costumes for a star-studded Halloween party in Los Angeles on Saturday evening

For her costume, Demi 31, showed up as a glamorous, busty Snow White with a plunging neckline and carrying a red apple clutch purse.

The star in attendance alongside a host of other stars at Vas J Morgan’s LA bash.

The songstress curled the ends of her raven black bob in and wore a large bow headband on her head, which matched her bold, red lipstick.

The Heart Attack hitmaker put on a sultry rendition of the classic Disney princess outfit as she strutted into the party in white platform Mary Jane heels.

 WORST DRESSEDJUSTIN BIEBER

They look familiar: At the other end of the spectrum we have pop star Justin who made minimal effort with his Flintstone outfit as he stepped out beside his wife Hailey on Saturday night

At the other end of the spectrum we have pop star Justin who made minimal effort with his Flintstone outfit as he stepped out beside his wife Hailey on Saturday night.

He simply opted for a shirtless look with shorts and a cap in order to transform into the character.

The event concluded a weekend of Halloween parties for Justin, who made an appearance at Cindy Crawford and Rande Gerber’s Casamigos party the previous evening.

On that occasion Justin took an unorthodox approach by dressing as a scuba diving mask, snorkel and flippers with a pink Hawaiian shirt and shorts.

Hard to miss: On that occasion Justin took an unorthodox approach by dressing as a scuba diving mask, snorkel and flippers with a pink Hawaiian shirt and shorts

CHANNING TATUM

Odd: On a night dedicated to glamorous ghouls, Channing Tatum and girlfriend Zoë Kravitz were among the celebrities who slightly missed the mark as they attended Kendall Jenner’s Halloween bash on Saturday night

On a night dedicated to glamorous ghouls, Channing Tatum and girlfriend Zoë Kravitz were among the celebrities who slightly missed the mark as they attended Kendall Jenner’s Halloween bash on Saturday night.

Kravitz, 34, arrived as Mia Farrow‘s titular character in Roman Polanski‘s iconic 1968 classic Rosemary’s Baby, complete with her legendary Vidal Sassoon haircut.

Dressed in Rosemary’s ghostly white nightdress and clutching a large – presumably fake – kitchen knife, the American star inevitably caught the eye ahead of Jenner’s celebratory event.

Joining his girlfriend of two-years, Tatum, 43, also thought outside the box by dressing as Rosemary’s devilish baby son in a garish blue romper suit and white baby’s bonnet, complete with vibrant yellow trim

KATHERINE RYAN

Funny: Katherine Ryan, 40, dressed as a giant Wotsit as she got into the Halloween spirit on Friday

Dedication: The comedienne strutted out of her hotel in London paying tribute to her favourite cheesy snack

Katherine Ryan transformed into a giant Wotsit as she got into the Halloween spirit on Friday.

The comedienne, 40, strutted out of her hotel in London paying tribute to her favourite cheesy snack as she flashed a smile.

Wearing a bright orange, furry suit, she added a pair of matching stockings and even carried a Walkers Giant Wotsit handbag.

Katherine was helped down the steps outside before squeezing herself into a taxi, leaving the driver looking rather baffled.

She certainly made sure to turn some heads in the quirky costume while celebrating the holiday in her typical hilarious fashion.

Src: dailymail.co.uk